I really love my Vita over my Wii U. Maybe it's just my gaming preferences but the Vita gets more exclusives and ports that interest me over the Wii U. I own SSB, MK8, and SM3DW and will probably get WWHD eventually, in the meantime I'm waiting for Mario Maker (delayed), XCX (delayed), Zelda U (yet ANOTHER delayed game...), and SMT x FE (not delayed but who the hell knows when thats ever coming here?) so my Wii U collects dust while I wait for the few good games to release. On the other hand I see a ton of games I want on the Vita.
In the end though, my personal taste doesn't matter, it's just the battle of the losers. While many here claim the Vita will not be remembered fondly, I very much disagree. I think both will be remembered as great systems that didn't get to live to their full potential.