I think both would do fine... 2210 is a little faster, but that wouldnt affect playback and viewing of music and photos. Playback of videos would be better on the 2210 though (higher bitrates).
Some good synth software for pocket pc is called Phoenix. I havent used it in a year or two but its really cool software
update: I feel like i made up the phoenix software because I cant find anything about it now :?