They explained why they didn't install the 360 version. It was very clearly stated. I do wish they would have done a comparison of a DL version of splinter cell for the Wii U off the eshop, but nobody is perfect. Either way, if you look through the pictures and watch the videos on DF/eurogamer you will notice that the majority of pictures show better on the Wii U than the PS3 and 360, obviously the PC looks and plays the best. There does seem to be a couple textures are lower on the Wii U in comparison to the 360, most noticibly the ground in one scene than the HDR from the night vision goggles, but than later it's the opposite. Most noticibly is the tearing on the PS3 and 360, that drives me insane in a game.
Gotta figure out how to set these up lol.
