If I'm going to think about it that way, I'd have to say I'm more impressed with SNES emulators on the DS. Not that the emus on the PSP aren't awesome... But with all the hype they get by "PSP fanboys" you'd imagine they'd be perfect.
In reality, the DS and PSP SNES smus are on the same level. Sure the PSP can play almost every single rom without glitches... But the DS plays every compatable game at 100% full speed (you can tell I'm not one to pick form over function). Same could be said about Genesis (though the DS emu doesn't have sound at the moment).
And with NesDS having both fastfoward and rewind functions, plus full speed and save states... I'd like to think I made the right choice :thumbup:.
Now, don't start with the flaming guys. I made a valid point!