I prefer my vita to the 3ds. The 3d on the 3ds hurt my eyes, the graphics were weak, and the system was uncomfortable to hold for extended periods. The vita may have fewer games, but the good games that are on it, I prefer over what the 3ds has to offer. I'm super pumped for killzone mercenary this September.. The vita is going to work awesome with the ps4 too.
So far I haven't missed it. I'm not happy about that though. I really wanted to like it.