The GBA is not only my favorite handheld system but favorite between handhelds and consoles. Arguably the greatest game library ever, with GBA originals and NES/SNES rereleases. I have so much fun with GBA. And its battery capacity is wonderful. I'd rather have a GBA than a Wii/360/PS3 right now.

I can't be convinced the DS is better, it is too big for me.

GBA "pwns" all.