I need new convertibles, one for DD1 and one for DD2 for DH's car. I plan to rear face until 4 and then FF as long as I can in the convertible. Are there ones that are better for FF in terms of size and "cool" factor? Like should I get a Foonf or Radian vs a Nextfit or the new Britax because they look more babyish and less enticing for a 5/6 yr old? Or do kids not really notice the difference?

I have a Foonf and it's certainly chair like and sleek, but it is kind of narrow and I wonder if it's really that comfortable for a 6 yr old. But the Britax has such a small seat depth that I imagine an older kid would be sprawling out of it. Any truth to those thoughts?