I dont see why you think that Xenoblade X will be far better game than Zelda U when every 3D Zelda game are great and Zelda U looks like it will one of the best Zelda games.

"There has not been any good Zelda game since Ocarina of Time"!?

I consider Ocarina of Time not only best Zelda game but best game ever, but saying there has not been any good Zelda after OOT is BS. I still need to play 3D Zelda game that isnt "any good", every 3D Zelda game is great (you have officials and players revives like fact), even if OOT is better than some later Zelda games.

Xenoblade X is the far better game, however it might lack focus on and length of story and may suffer from even more stupid useless low quality fetch / kill side quests than its predecessor. Xenoblade Chronicles had 60+ hours of pure AAA storyline (without sidequests) but the story in Xenoblade X will be much shorter, however still comparable to an average Zelda game.

What Zelda will do better is the interaction with the environment (you can cut grass or dig holes). Xenoblade does not have that at all, the world does not feel as alive as it could. The music in Zelda will also be much better since the vocal tracks in X will not even come close to the AAA Xenoblade Wii soundtrack. Also the dungion solving elements are a plus for Zelda but the open world concept is a very high risk which could riun the game if done wrong, especially if the story becomes an unimportant side element like in Skyrim.

However, there has not been any good Zelda game since Ocarina of Time, all later entries were either too short (MM), to childish or had boring Midna sections which kept me from finishing any of them.

Xenoblade X will once again ask a lot of philosophical and moral questions and feature a very deep storyline which will provide a value and an impact to your life. Thus it will easily be the game you will remember and value more.

Look, I really don't want to stick a dagger into X which I'm really looking forward, but people are making me have to do that. Have you seen the graphics in X? They're poor - particularly in exactly the two things you mentioned - details and texture work. Some of the scenery looks fantastic from afar, but get close and the details and textures really show the game up (not to mention the character models). If Zelda Wii U delivers graphics of the quality that we've seen until now, it will have objectively better graphics than X - and it probably took them the same effort to get a great-looking cel-shaded game as compared to Monolith's meh-looking realistic game.

There's nothing ambitious about X's graphics, whereas Zelda's graphics are definitely ambitious - I've yet to see a dynamic game like Zelda go for an art style like that.

Xenoblade Chronicles is masterpiece and Skyward Sword isn't exactly best Zelda ever, but Zelda U looks like will be one of the best Zelda ever, and Xenoblade X doesnt look like its better or masterpiece like Xenoblade Chronicles.