DS mainly , I have a psp there are a few good games for it but mainly I think it was a waste sometimes, I love the 5 games for it, and I've looked for many other games for it, I look for and look for it , but I can't find crap for the psp. Only sports games or rather gorey violent games (which I both distinctly hate) And along with that minor annoying feature, I can never use anything the psp gives me , internet, pictures, I can do squat for it. Unless its games, everythings to complex, it's got some good gaming features, but face it. The psp is to complex for alot of people to handle unless they have the most epic attention span ever to read the manual. I don't mind the psp the gaming features are great (especially with the very few games I have) but face it, the psp could never live up to the quality the ds gaming features hold.
The ds on the other hand, instead of making it difficult to use all this complex crap, they go 'okay pictochat, game enter mode , game boy advance enter mode, and techinical stuff.' and then they go 'to make it look official, lets just throw in this useless technical manuel sicne everything so gosh darn easy to get.' Seriously. The ds is amoungst one of the greatest gaming consoles they've ever came up wih, I can get tons of games for the ds, pokemon, tamagotch, zelda, and tons of other casual gaming games, that aren't fild with gore, violence, inapppropriate conduct, or sports. I have like 20 games for the ds, 5 for the psp, half of em I don't even play, I'm not knocking the psp it's a good quality gaming experience but overall ds meets my high quality gaming standards.