Gameboy Advance or Gameboy Advance SP?

Basically, I want to get some form of Gameboy Advance so that I can play Gameboy Color and Gameboy Advance games again...

I can get gameboy advances cheap, but SPs cost more. However, I remember them having a lighter screen?

Any recomendations on which is better?

Thanks

SPs have a back light to them, fold, and have a built in battery. GBAs don't. That's about it.

GBA: SP >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> GBA

Seriously. You've got rechargeable batteries, a backlit screen, smaller form, and clamshell design for incredible durability. It's no contest between an SP and normal GBA

get the sp just on the fact that its rechargible you will get fed up of using aa,s