S.K.
I love the Radian seat- it has a high weight limit and has a small footprint on the backseat. A few drawbacks- it's very heavy and not so easy to install correctly. The latch only tightens on one side so it can be tough to get in tight. It folds to transport- but is so heavy that I wouldn't want to haul it far!
I don't know much about Recaro- but Britax seats are by far the best we have ever used! They are so easy to install correctly. They tighten up like a breeze.
Good luck with your choice.
-S.