Depends obviously people who own DS's are going to tell you to buy that and people with PSP's to buy that. People on either side will obviously twist a few things, as I can already see here, about the other system to throw some dirt on it and not mention the flaws of "their" system.
Gamewise the DS probably wins this one. You got a really good selection here with stuff like Mario Cart, Nintendogs, Metroid Pinball, Castlevania, Phoenix Wright, Advance Wars, so on. Cratridges of course which is kind of limiting in a way but that doesn't stop Nintendo and the dedicated influx of the good third party stuff. The touchpad is fun of course and a great feature and of course you have WiFi in there as well for some multiplayer or playing hangman with Pictochat.
The PSP if you had asked this a couple months back game list wouldn't of been that impressive but it has gotten a good number of high quality games lately. And of course more are to come with Metal Gear Acid 2, My Katamari, Tokobot, Armored Core: Formula Front. So the PSP is having it's share of unique and quirky games as well. But the best so far are pretty much Lumines, Wipeout Pure, Metal Gear Acid, Burnout Legends, Twisted Metal: Head On, GTA: Liberty City Stories, SOCOM: Fireteam Bravo, SSX On Tour, FIFA 06, etc.
Graphicswise the PSP obviously wins. Near PS2 quality graphics nuff said there.
The PSP has of course the ability to play movies on a very attractive LCD widescreen. You can play movies off of UMD, put your own on a memory stick, or listen to MP3's. The memory sticks are pretty expensive. You can find a SanDisk 1 Gb card for around $75 if you look online. The new Giga pack coming out will have a 1 gb card and a USB cord for $50 more than the Value Pack out now.
The battery life is not three hours...like some DS fanboy will tell you. That depends on what you're doing with it. Listening to music or just tooling around obviously will not drain too much. Playing GTA:Liberty City Stories, the most taxing game yet, straight won't give you as much time before needing a charge. Would you really play a game for six straight hours anyway on a handheld? No one should be doing anything for six straight hours other than working and sleeping.
And of course the PSP has WiFi for multiplayer gaming as well as the DS and an internet browser.
There you go it depends on what you want now and later. As well as how much you want to spend. You're going to be spending $150 on a DS and at least $250 for the Value Pack PSP, or $300 for the new Giga Pack. Both have a good library of games now with more always coming out, but the DS still is the strongest there for now. As far as an all in one portable media system goes ya can't beat watching your movies on a nice big LCD screen and listening to music on a PSP. But you should do your own research as well to just get the entire picture.
"You can't sit on the fence when it comes to Jesus, Satan owns the fence." Mark Cahill
2-151 D Co. Infantry (Air Assault)