Britax Advocate vs Marathon

Britax is one of the most popular car seats that parents can trust because they are not only made according to safety standards but also convenient and easy to install in the vehicle. Depending on what you want to achieve however, there are so many options from the catalog such as Britax Advocate Vs Marathon. These car seats are ideal for growing children but are very similar to each other and before deciding the option, let’s see the comparison below.

In this comparison, we are going to talk about:

  • Which Convertible Car Seat to Buy
  • What are Britax Advocate and Marathon
  • How are the Design of Britax Advocate and Marathon
  • How are the Installation of Britax Advocate and Marathon
  • How are the Fitting of Britax Advocate and Marathon
  • What else Britax Advocate and Marathon can offer
  • Britax Advocate Vs Marathon

Convertible Car Seat

Safety car seats are mandatory in so many different places but this is not without a reason because there are so many accidents that have been injuring or even taking the life of children who are not secured in their proper seat. For adults the safety belt is what protects our body from bumping into the interior of the car or ejecting it when in an accident but our kids bodies are too small to be able to be fitted properly inside the seatbelt and this is very concerning.

Thankfully car seats are very common so you can find them easily, including available in a huge range or prices to make sure they are matching well with your budget or important features to have. It can be confusing at the same time but there are tips on how to find a good option or help in shopping for the best car seat for every parent.

First consider the installation process since the seat needs to be secured on the car’s own seat. The common feature to look for is with LATCH or lower and tethers for children. The system allowed for car seat installation easier and correctly without having to route the seatbelt but, nowadays car seats are usually coming with both of them or can be installed both ways. For seat belt installation it is great if they have built-in lock-offs that hold the belt in place in order to make the installation more secure.

The overall ease of use is also very important because we are using this seat almost everyday and getting a car seat that is user friendly is a great plus for making sure the safety functions are done properly. The example is car seats with a convenient system to get your kid in and out of the car quickly so make sure the harness is easy to clip and unlock when needed but is still strong enough to keep the passenger in place. 

Car seats are manufactured according to safety standards so as long as they are secured properly, they will work as designed but there are companies also adding side impact protection in their products. They may cost more but it is great for parents with the concern and a sign that the manufacturer is taking an extra step in order to protect the passenger. In comparison to the standard model, usually car seats with side impact protection are more rigid or have a higher score when tested against impact in the lab.

 Britax AdvocateBritax Marathon
Product Dimensions‎23 x 20.5 x 23.5 inches
‎23 x 18.5 x 23.5 inches
Shipping Weight‎5 Pounds
‎5 Pounds
Best offerCheck priceCheck price

About Britax Advocate and Marathon

Just like many other products, the car seats can be selected based on the parents personal preference as well, including the type of vehicle they use about the seats and space inside the cabin because varying cars have their own native system that sometimes is not as compatible with every car seat marketed. The budget may play a role as well depending on how much you want to spend or what brand and what type of features must exist on the car seat.

For parents with a favorite brand, it is easier to shop for their kids car seats since we don’t have to look for different models and from different companies. Among the options, Britax is one of the best choice for children safety product and baby care system starting from their amazing stroller but, they are also carrying a huge range of car seat from infant stage to pre-teen or older kids who are ready to leave their car seat in just few years such as the popular Britax Midpoint Vs Highpoint.

If you are here then it means the car seats are meant for kids in the early age or after they exceed the infant carrier which is the perfect stage to use a convertible car like Britax Advocate and Marathon. These convertible car seats are popular not without a reason because what they can offer is not only safety but also the ease of use and comfort for the passenger. What’s often confusing is this brand carries so many similar seats so it may take some time to decide which will be the best choice.

Both of them are very similar in terms of safety and the ease of use but different seats usually have different types of fitting and slightly different installation or some features you may like. In comparison, the Britax Advocate and Marathon are very easy to install which is equally the strongest point that you will love from the two. They are also very comfortable but the Advocate comes with additional safety features that you may want to have and is not always present in most car seats.

Britax Advocate and Marathon Design

Before checking what the Britax Advocate and Marathon can offer, let’s see the unit first and as you can expect, the two are looking like most convertible car seats out there with the same shape and type of build. The base of these seats are square and will take up about 14 to 14.5 inches of your seat but the widest part of the seats are wider at around 18-19 inches from the side of their shoulders. Overall the two will take up the same amount of space in the cabin.

On the fabric, they are using the same soft and equally padded seat but the fashion is very different so it can be a shopping decision as well. Another difference is the side padding located on the outside of the seat because the Advocate is thicker in this side or bulkier compared to most seats from Britax including the Marathon. 

Britax Advocate and Marathon Installation 

Now for the most important part, let’s see what the Britax Advocate and Marathon can offer starting from how to install them. What makes the two very reliable and easy to use is the addition of Quick Tight system that you can see from the front of the seat. The way to install the seats using a seat belt is very convenient. Just rotate this button and open the front of the seat to expose their seatbelt slots; both available for front and rear facing method.

Just put the seatbelt on its routing, tighten it, and clip it. Close the front of the seat again and we are done. You can use a lower anchor as well but this is less convenient so we do think the seat belt installation is more convenient to always use. Do note that the Marathon is also available in the older system without Quick Tight feature so if you get the regular version the seat belt installation won’t be as fast and this specific seat will work better with LATCH.

Britax Advocate and Marathon Fitting

Next is the fitting system and since both Britax Advocate and Marathon are convertible car seats, they are useful from the infancy stage to the growing stage. As for the weight range, they are the same from 5-40 pounds when installed in the rear facing mode while the front facing mode is from 20-65 pounds. The two are very much the same in terms of height range or the harness position which follows their head and neck rest up to 49 inches tall.

Britax Advocate and Marathon Features

Lastly, on the added features, this is where the two are very different. What makes Advocate more expensive is for the added safety feature located on the side flare or shoulder case on the seat which makes it look thicker compared to common convertible car seats. This side-impact protection is offering a higher protective function for when there is a force applied on the seats from the side such as if there is an accident or other vehicle bumping into the side of your car.

In addition, for the other feature there is an option with ARB or anti-rebound bar but our seat today is their regular version. This ARB is removable too if you prefer to leave it at home but in combination with side-impact, the Advocate is a higher one in terms of impact protection. You can add cup holders as well yet they come separately from the seat.

Britax Advocate vs Marathon

These seats are very convenient to use, especially the models that come with Quick Tight function since it allows for a fast and safe seat belt installation. The safety feature is what set the Britax Advocate and Marathon apart the most because Advocate has this additional side-impact placed on the outer side of the seat, specifically the shoulder flare to help improve the safety performance. Out of this feature their fitting and overall ease of use is the same.

- Easy installation: Patented click tight makes car seat installation as simple as buckling a seat belt
- No rethreading, ever: Quick adjust 14 position harness with click and safe, snug indicator gives a click sound when the harness is tight
- Adjust accurately: Harness indicator gives an audible click when you’ve pulled to the proper tightness
- Surrounded in safety: 3 layers of side impact protection, quick adjust head protection, steel frame and impact absorbing base
- Easy installation: Patented click tight makes car seat installation as simple as buckling a seat belt
- No rethreading, ever: 14 position harness, 2 position buckle for a comfortable fit as your child grows
- Relax and recline: 7 recline positions ensure comfort and the best vehicle installation angle
- Surrounded in safety: A layer of side impact protection, steel frame and impact absorbing base


You can go amazing with any of these seats because they are equally convenient to use. But, for parents who are concerned about side impact or simply want to have a seat with added safety feature, we recommend Britax Advocate.