I think both are great handhelds and I don't care if the one has the better lineup this year or next year or whatever.
Overall I prefer the DS due to its design/controls, its RPG/puzzle/RTS library and because it's the only system outside PC which gets original p&c adventure games*, but on the other hand unique, original and great games like LocoRoco, Patapon and Lumines along with some exclusive new RPGs and remakes were reason enough for me to buy a PSP.
(*Wii doesn't count for me in this context as - with the exception of one game - it only gets p&c ports)








