I dont have a Vita, but this could swing it for me.
It's hourses for courses with regards to what functionality suits each individual. People might say just get a second TV or play in a different room etc, but for me I know the missus whinges if we're not together in the same room, threfore we can both sit together and i can play my full PS4 games on the Vita. And proximity wise i'll be 3 meters from the console/router so should be fine.
Boom, that's it exactly, buy to your needs/wants, otherwise you'll be procastinating over little differences/opinions for ages .