Eh, Xbox One, for all its faults, would probably be superior as it seems to do just about everything the Wii U does better and more, except off-screen functionality.
That is except for nearly everything being behind a pay wall.
is the web browser just as good? The main thing I like is how quick and seamless web videos are as well as the touchscreen interface.
I use the Plex browser page to stream media off my computer to the wiiu. I can rewind, pause, move the play head exactly where I want, hit the dpad to move the playhead back a few seconds, etc. and it picks up and plays immedialty w/o hardely any delay or issue. Its very interactive.
On 360/PS3 through DLNA, media streaming was very finicky. half the time if I tried to pause or rewind it would just error out and quite back to the OS. And it would never really show you visually how fast you were rewinding or forwarding, and if it did work it would take like 10/20 secs to actually stat playing again. WiiU is instant playback, with instat feedback and very smooth. And no messing with any settings codecs/etc on your server.
And using an organized touchscreen interface, its much quicker to navigate/search and find the media I want, with no hassle, as well as showing a bunch more info for the media(posters, subs, resolution, summary,etc). I can also continue to browse and load up other videos and web pages, while the main video/movie plays on the TV with no interuption.
here it is in action on WiiU, though they have just recently updated and made a better web interface.
http://www.youtube.com/watch?feature=player_detailpage&v=4cBWwCSqF4Q#t=648
Even Netflix I can turn on the WiiU, launch the app and play a movies much faster than I could on my other platforms by the fact alone of the touchscreen and not having to scroll through menus are press buttons, i just directly touch what I want, the instant the icon is loaded up.
And I dont have to pay anything extra for this features. And you also have a very nice TV remote already in your hand for udjusting inputs, volume etc.
I should say I havent touched an Xbox one yet. But I know some of these things the Xbox One cant do. But I am sure it would be nice for TV/Cable. but I dont really watch that.
In a more perfect world there would just be a native Plex app avalaible for the WiiU, though it is not to much of a hassle to set up on your own.