XBO controller, Dual Shock 4 and Wii U Pro Controller are all great. I have no favorite between them.
I also find the Wii U tablet controller quite comfortable, followed by my PSVita 2000.
My OLED-Vita has the (slightly) better display, but due to the sharper edges I need a grip for longer game sessions, the newer model stays comfortable.
The handling of my 3DS XL is okay, but I prefer every other 8th gen device/controller.