Can’t decide between RG35XXSP and RG40XX!

Hey guys I’m looking to pick up one of the two mentioned models. I’m looking to relive a lot of the GBA games I grew up with. I can’t say I’m totally interested in anything out side of GBA if that influences a decision.

It would mainly be used to play through a couple pokemon games and other platforming titles. Which of the two is better in your opinion?

Seems the RG40XX has the nicer display and great buttons, while the SP clamshell gimmick is also incredibly convincing. I seriously can’t make up my mind.