The best D-pad by far is sony 's and I'm sure they have a patent on that, splitting each arrow is far better than anything else. The PS4 D-Pad is essentially perfect.
No way! Hitting diagonal directions on the Dual Shock d-pad is a teetotal pain in the butt. The Nintendo setup is much, much smoother in comparison.
It's all subjective, of course, but the perfect controller for me would be a 360 gamepad with a Nintendo style d-pad in place of whatever janky crap MS uses for theirs.