Speaking from experience, both are garbage. Neither is better than the other and both deserve the sales they have now. There's a strange obsession in the forums over these 2 unrelated devices for whatever reason. Are people really so insecure about the platform of their choice that they have to justify the consoles failure to feel good about their purchase? I like them both, but both systems have huge flaws in them.
The Vita has the most ridiculous memory card prices ever. I mean seriously, $40 for a fucking 16gb memory card? Screw that, I'll buy something better for cheaper. The system is also full of ports, it's got a few unique and amazing games but they'll go unnoticed by the majority of people. Not only that, a lot of games that ARE good are digital only releases... which means you have to buy a larger memory card because those games are often 2-4gb+ and that'll quickly fill up the $10 4gb memory card you bought, which by the way most stores don't even sell anymore! So even if you DO buy only physical you now have to spend $20 for an 8gb memory card unless you wanna hunt down a 4gb online...
The Wii U has had a ridiculously long drought. For a company as large as Nintendo to neglect their IPs is bullshit. Maybe they hid it better last gen with the Wii, but this generation you can see it first hand without the millions of shovelware games being thrown at your face. Even if you like all the games they're releasing then there's only like 3-4 games actually worth buying. Half of which are freaking Mario titles, not even a proper 3D main on top of that. Are you a Zelda fan? Well too bad because it was delayed the same way XCX, Mario Maker, and a million other titles on the system are/were. I didn't even want a Wii U until XCX finally came out (my gf made me buy one 
). So for now I'm stuck with SSB, SM3DW, and MK8, which are good to decent, but not worth owning the system for. Especially not the price. $300 for a system that's barely stronger than my PS3? For $50-$100 I could buy an X1/PS4 which will have MUCH MUCH better support in the long run, not only that they're more powerful! Plus they don't have a stupidly small storage capacity, 8-32gb standard?! Don't get me started on that controller either.
Neither are that great. People gotta stop defending these turds. Both lack games worth owning and neither will have very long lifespans either.
