I've been doing tons and tons of research on convertible carseats..It seems that while the Britax Marathon is very popular and people like it a lot more people are loving the diono radian rxt...Money isn't an issue for us with this but I found a great deal on the radian anyway and can get it for 191 on kohls.com.
Am I making the right choice going with the radian over the marathon?
Re: is the radian better than the marathon?
We got the RXT because it doesn't expire for 10 years, it goes up to 45 pounds rear facing and it's a booster up to 120 pounds. It's top rated among other carseats and you're able to fit 3 across because it's so slim.
So, IMO, yes it's so much better than the marathon.
I made rachelmichelle1 my bitch.