I'm going to go with 3DS, but this is mostly because I had very limited experience with the handhelds prior to now. I mean, I owned a Gameboy Color and GBA as a kid, but I played Pokemon, Yugioh, Chain of Memories, and a few Dragonball games. I didn't really get to experience much of the library because I would rather get games for home console back then. I've branched out a lot more with the 3DS and Vita. The 3DS has a lot going for it too that I like now and would have loved as a kid. The streetpass thing is pretty simple, but it also really makes me want to carry around my 3DS with me. As a kid, it would have given me something to play and look forward to when going out with my parents to boring places as well. Such a neat little system.