LOL..Asking this in a Playstation Section is definitely giving you one answer only.

Anyway, i would go for PSP as well. Played both DS and PSP before, i would still stick to PSP. Games on PSP is nicer than the DS for me..

Well, maybe because i liked the games on the PSP..Therefore, the reason for you to pick a console - Find the game you would like to play most and get that specific console that supports it...