Usually prefer Nintendo, but in this case Xbox One easily. Game selection is much more vast, varied, and quality - even before 90% of Wii U's best titles got ported to Switch. And as I've stressed on quite a bit, I just don't dig that big clunky Fischer Price "Gamepad" and the convoluted Miiverse of Wii U.
"We hold these truths to be self-evident - all men and women created by the, go-you know.. you know the thing!" - Joe Biden