There is no right or wrong, better or worse here. It's just like anything else. Ford vs. Chevy, Coke vs. Pepsi, import vs. domestic.
It depends on your personal preference and what you enjoy. If all your friends are on a certain one then you will enjoy it more simply because you have people to play with.
Performance wise you can compare shit all day with all the graphs and colors of the wind but they are the same damn thing. Ooooohhhh one has higher fps on certain games or better graphics. The human eye can't determine the difference in 720 and 1080 so it doesn't make a damn.
Just whichever you prefer. Xbox is my preference so I go for the One. The controller is also a LOT better. And has better exclusive games to me.