ha ha .. people should know what they are talking about before they post..
Activision Anthology on GBA emulates a bunch of classic Atari 2600 games. That's not Commodore 64, that's pretty different..
I really like the ease of interface of the GP32 better, using Smartcards instead of Flashcards. Flashcards take ages to burn, you have to rewrite it from scratch each time (as far as I can tell..) plus it's more expensive for far less storage.
If I want to stick a game onto my GP32 real quick, it's just as easy as drag and drop pretty much.. can't beat that (not yet!)
most importantly, all game system emulation is just handled better on GP32 than on GBA. Ok, maybe pocketNes might play a little better than Little John, but GBA has to squish it and it doesn't look as good - Little John might have lower compatibility too, but you don't hear people complain about it ever, anyway.