I suppose the Xbox360 is slightly sub-720p so the xbox1 version probably has the slight edge.
This cannot possibly be a real question. O_O
EDIT: Voted for the 360 version just for the fun of it and I see I'm not alone
"I've Underestimated the Horse Power from Mario Kart 8, I'll Never Doubt the WiiU's Engine Again"
Fatal Frame 5 localization petition: https://www.change.org/en-AU/petitions/nintendo-of-japan-north-america-localize-and-release-fatal-frame-on-wii-u-worldwide
Operation Zero on Twitter: https://twitter.com/0perationZer0
Bet with fatslob: Watch Dogs on Wii U will be technically worse than on PS3/360
Bet with mZuzek: Zelda Wii U will run at 720p (He says 1080p)
Will save the WiiU: Pikmin 3, price cut, 3D Mario, WiiFit U, 3rd party support (CoD, AC, Batman, Watch Dogs), Mario Kart, Super Smash Bros U. another price cut.
Will Save the Xbox One: Titanfall,Remove Kinnect, price cut, next Gears, next Halo, another price cut.
My Real Redneck friends
Xbox 360 will look better because the developers have more experience and familiarity with the 360 hardware than the One.
I hope somebody actually takes this post seriously.