Definitely the Wii U Pro controller for me. It feels the most comfortable in my hands, and also has the best battery life, both of which are important to me.

PS4 is great too...but I'm not a fan of having to charge it every few sessions.

Xbox One: I own one original, three originals with headphone jacks, one Xbox One S version

+Great all around.
+Best rumble in the business
+Offset analog sticks that I love
+Great battery life

-AA batteries (though I already have about 10 rechargeables laying sold and always ready).
-Early versions didn't have standard headphone jack
-3/5 of my controllers have drifting issues.

PS4: I own two standard controllers. One PS4 Pro version

+Quality speaker in controller
+Great all around controller
+Motion controls (sensor light is great with Camera)
-Terrible battery life
-Options/share button don't stand out meaning lots of missed input attempts. Better than accidentally pressing?
-underutilized touch pad.

WiiU Gamepad: I only own one from 2012 launch
+Every bell and whistle possible
+Touch screen is great and looks good
+Feels good in hand
-Not as good for action games (ie: Ninja Gaiden)
-Now analog triggers
-Hideous battery life
-No micro USB support
-Shitty rumble

WiiU Pro: I own one from launch
+Feels fantastic. Maybe better than the competition
+Full charge lasts forever.
-No analog triggers
-No motion
-does it even have rumble? I can't recall.

All are a step up from last gen. When I go back to my older consoles, they feel clunky. Even the beloved Xbox 360 controller feels chunky. My ratings?

Xbox One S 9.5
PS4 Pro 9.0
Xbox One standard: 9.0
PS4 standard 8.5
Wii U Gamepad 8.5
Wii U Pro 8.5
Xbox 360 8.0
PS3 7.5
PlayStation Move: 7.5
Wii Remote Plus: 7.0
Wii Remote: 6.0