Xbox was so very unquie for it's time. There was a lot of new fresh ip's that really made the system shine.

Halo
Jade Empire
KOTOR
PGR
Fable
Pyschonaughts
Forza

And then it saw existing franchises coming to the consoles for the first time.

Elder Scrolls III: Morrowind
Half-Life 2
Splinter. Cell
Grand Theft Auto

Voted Xbox Hands Down

Splinter Cell was a new IP and it came on Xbox first, though.  

The Wii U was a massive failure that didn't do much for the industry as a whole.The OG Xbox have birth to Halo and Fable, not really a competition.

I enjoyed 3D world, not gonna lie..

xbox HALF LIFE 2

Don't have much direct experience with the OG Xbox, or Xbox in general.
But I'll basically take my response from the Vita vs. Xbox thread.
Basically the KOTOR and Battlefront games are enough to make me pick the Xbox, plus some other third-party games from the time.

Wii U by far for me. It had:

- The best 2D platformer I've ever played (DK Tropical Freeze)
- The best action game I've ever played (The Wonderful 101)
- Two of the best open world games I've ever played (Zelda Breath of the Wild and Xenoblade X)
- The best couch co-op game I've ever played (StarFox Zero)
- One of the best Hack N'Slash games I've ever played (Bayonetta 2)
- One of the best and original competitive online games I've played (Splatoon)
- The turn based JRPG with the best combat system I've ever experienced (Tokyo Mirage Sessions #FE)
- One of the most original and immersive survival horror games ever (ZombiU)
- The biggest Mario Kart game (before 8 Deluxe)

The Xbox didn't have a single "best something something ever" for me. But it's not just that. No, no, no... the Wii U had much more going on for i. It was also backwards compatible with the Wii so I could play all of its games; it had a pretty big Virtual Console that allowed me to experience tons of classic games; Off-TV was incredibly handy not only for gaming, but for other activities like watching Youtube, Netflix or browsing the internet (I have probably over 1000 hours spent on that alone); it had lots of great indies like Shovel Knight, The Swapper, Pushmo World, Affordable Space Adventures... and while they were not very numerous, it had some great multiplats like Tekken Tag 2, Black Ops 2 and Darksiders I and II.

The Xbox was not a bad console at all. It had some great exclusives in Halo 1, Halo 2, Fable, Morrowind, The Chronicles of Riddick, tons of multiplatformers and graphics well beyond what the PS2 and GC could display. But to me all of that falls VERY short on what the Wii U gave me.

While I love Bayonetta 2, Xenoblade X, Tokyo Mirage Sessions. That console sucks shit to even use much like Wii. Xbox still has Jet Set Radio Future, Metal Wolf Chaos, Panzer Dragoon Saga, Shenmue II, Otogi 1-2, and a more fun console to use. Xbox for me.

I voted Wii U. I'm still playing mine. I feel it is a pretty underrated console, especially the controller. I never played Wind Waker on Gamecube, and I can't imagine trying to do so without the map constantly displayed. Navigating while sailing must have sucked before.

For the Xbox, it was a Halo and Halo 2 machine for me and my friends in college. Very little else got played. I am not super familiar with the full library, but I feel like most of it is also available on PC.

This is an incredibly hard choice for me.

I quite like both consoles; neither had an enormous number of games that appealed to me, but they both had a strong nucleus of excellent titles that I'd never want to go without, like Halo 1/2, Star Wars Battlefront, Doom 3, and Panzer Dragoon Orta on Xbox, and BOTW, Bayonetta 2, Tropical Freeze, Mario Kart 8, and Splatoon on Wii U.

I actually found the Wii U to have the more comfortable controller of the two, but on the other hand it had the battery life of gnat, while the Xbox had a less sluggish and bloated OS, and was by far the more groundbreaking system.

I'd say the Wii U's elite cadre of top games is slightly better than Xbox's, but on the other hand actually owning one during its time was quite frustrating due to the constant droughts and the disappointment of it not living up to my pre-release expectations or its own predecessor. Having an Xbox back during the 6th gen was significantly less irritating.

I'm gonna withhold my vote for now, this one is too close to call.