The problem with the Wii U is that someone at Nintendo just didn't do their research, the specs weren't high enough to run high settings for the PC games that were coming out at the time, much less in the coming generation. Additionally, the game pad is an unnecessarily bundled peripheral driving up the price, now that Sony and Microsoft have figured out how to let you do the same thing with devices you already own. And I don't know about the Wii U being more accessible to develop on since they still have the inferior multi platform versions and have yet to release anything remotely near the graphical level of Uncharted, Killzone, God of War, etc.

Also, Vita's remote play is a native feature that works with all PS4 games out of the box. It's an underrated handheld; I initially snubbed it and bought a 3DS instead but after owning it for less than a month, my library is three or four times the size of my 3DS, much more diverse and refreshing, and between my bundle and PS+ I've yet to spend a dollar on a single title.