Personally I would go with the SP, because my GBA, while it is comfortable to hold, it is damned near impossible to see what's going on on my screen. I don't know about the rest of you, but I have an insanely hard time with it, so yeah, plus, I think the SP is perfectly comfortable, but I have small hands, so ya know, whatever. Anyway, as PIAC said, we can only offer our own opinions, and all you can really go by is your own, after testing both and seeing which one would suit your needs the most.