1. you got a 2ds, not a 3ds. If it was intended for looking games in two screens like the 2ds, that's what the ds from previous generation is for, and the ds games can also play in the 2ds and 3ds machines; the 2ds simply allows to play games that require newer specs.
2. I have both, Vita and 3ds; I still prefer 3ds because of the stereoscopic effect, plus also I like more the games for the 3ds. With the 3ds I can simply turn it on and release some steam since its games are in general more casual; the Vita games in general require that you commit to them, which many times feels like homework. No, I don't play games to have another chore