I'm glad to have a vita over 3DS. I'm waiting for a price drop for the digital version of wipeout 2048 (I've had HD/Fury since the hack)... I've also got Blazblue for Vita, but the version I have on PS3 is outdated, so I can't use cross play.
Personally, I wouldn't find any interest in Mario games. I play mostly fighters, and I do have both Jumping Flash games and Klonoa on my Vita if I really need some platforming.
I'm not even on PS3 much at all, except for Marvel Vs. Capcom 2. I'm waiting for Tekken Tag 2. But, I may be right back towards the vita again when Assassins Creed 3: Liberation comes.