I dunno, I own A LOT of PSP games and A LOT of DS games, all of which are good.
Same here. Lately I've been getting far more PSP games, though. DS doesn't have too much that's really been interesting me, although when something does come out, it's AWESOME, like Gyakuten Saiban 2 last month, and now Castlevania PoR this week. On the PSP side of things, in the last month or so alone, I've bought GTA VCS, Killzone Liberation, Spectral Vs. Generation, Ridge Racers 2, Gundam Battle Royale, Guilty Gear Judgment, Ace Combat X, and Shinobido Homura. I can't complain. My PSP generally sees more use for the arcade ports like Outrun 2006, Virtua Tennis, Tekken DR, and SFA3, too. It rocks just like the DS does.