I own a Vita and my mate a 3DS. Ive played them both enough to compare etc. Personally, the Vita is better due to awesome screen and dual analog. All the games my mate has for his 3DS suck control wise until he got the circle pad pro.... that seems really poor to me. Finish your console Nintendo before you release it.

However 3DS has a pretty good library now and lots of cool features, expect the 3D. It fudges with my eyes and a gimmick is a gimmick. Playing in 3D does not interest me. But as Lembas said the Vita has so much more potential. Wee'll all just hope Sony uses it as well as game developers. The Vita feels more like a complete console gaming experience.