It's your choice. But here are some info on 3DS.
Although it's not out yet, the 3DS is the first glasses-free 3D gaming device in the market(like the ones in theaters minus the glasses). It also supports multimedia, motion control, touch-screen, 3 cameras, and Wi-Fi. It is also compatible with the DS software and DSi wares.
Here's a video that explains how the 3D works:
http://www.youtube.com/watch?v=85DcIyq9H-s
Some 3DS features (there's more that weren't announced by Nintendo) you don't know about:
The 3DS graphics is the closest handheld gaming device that comes close to 360/PS3 graphical wise(you gotta see it to believe it; specs don't count), it supports 2 screens, 1st screen as a 3D screen without glasses(it's real and it works, you can also turn off the 3D if you want 2D), 2nd screen as a touch-screen, compatible with the old generations of DS softwares, gyroscope, accelerometer, audio player, 3 cameras(one inside, and two outside), capable of taking 2D/3D photos and capturing 2D/3D videos, 2D/3D movie playback, multitasking(i.e. You can access web browser while playing a game), Virtual Console Service(which was not available with the DSi/DSi XL) and some 3D remakes of classic retro games(GB, GBC, GBA, NES, SNES, and more), also compatible with DSi Wares, 3DS Mii Plaza (Mii creation), augmented reality games, CrossPass" (which can automatically seek and connect to wireless network nodes such as Wi-Fi hotspots, sending and downloading information in the background while in sleep mode or while playing a game), 3D TV streaming(only available in Japan at the moment), e-book reader,better online capabilities, video chat, shop channel, web browser (and anything you do on the web like mail, facebook, etc.), and more which weren't fully announced by Nintendo. Plus the games are longer and are quality games.
Some games that will be coming out for it:
Metal Gear Solid 3, Super Street Fighter IV, Resident Evil: Revelation, Resident Evil: Mercenaries, Legend of Zelda: Ocarina of Times, Kid Icarus, Paper Mario, Star Fox 64, Professor Layton vs. Phoenix Wright, Mario Kart, Kingdom Hearts series, Final Fantasy series, Dead or Alive 3D, Ninja Gaiden, Samurai Warriors 3D, Assassin's Creed: Lost Legacy, Ghost Recon, Splinter Cell, Call of Duty, Megaman Legends 3, and more. There will also be 3DS ware games, like Cave Story.
Some features:
http://www.youtube.com/watch?v=GRSdUvbLhSo&feature=related
3DS Shop Channel:
http://tinycartridge.com/post/1431454868/nintendo-3ds-shopping-channel-trailer-in-an#disqus_thread
Just in case you go "where's the 3D!?" it won't work on your computer screen, you gotta see it in person to see the 3D.
Few of the games that will be coming out for it:
http://www.youtube.com/watch?v=AzOUHU5SKSA
Super Street Fighter IV 3D Edition:
http://www.youtube.com/watch?v=RPuYwxudQ8A&feature=related
Metal Gear Solid 3: Snake Eater:
http://www.youtube.com/watch?v=sOBWzuTsKNA
Professor Layton VS Phoenix Wright
http://www.youtube.com/watch?v=sDCZX5b8Q6s&feature=related
More games being played live:
http://tinycartridge.com/post/1409229740/nintendo-3ds-videos-for-ocarina-of-time-resident-evil
You can check out more about 3DS here:
http://en.wikipedia.org/wiki/Nintendo_3DS
You should know that glasses-free 3D cameras and videos don't come cheap and you're looking at about $500+. If you think about it, the iPod Touch cost more than the 3DS when it comes to features and games.