Umm you really can't decide which ones better because one is portable and the other is a console. Of course the ps2 will have better graphics because it's a console, but if your always away from the house you can play games, listen to music, watch movies and other things than the psp is a good choice. You can't really choose which ones better. Just get both. Can't go wrong there.
hehe - yeah, just get both, no. I do have both and well.. im not so sure either, i think i would choose PSP though - i mean , the graphics aren't bad at all - i have to say, with some games, i think PSP beats PS2. also the fact that it is a portable - u dont need cables nothing! bring it with u anywhere u go... put music/dvd's/music on it, anything really.
ps2 is better because yes the disk store more, just look at gta on psp it has like 25 missions ond ps2 it has loadz. so there u go, but cummon the disks are a quarter of the size and its still an excellent machine!
Depends on what you want a console for, do you prefer to have your friends round and all have a game togeather on something or would you prefer to play alone say on your dinner break or on the train?