For me it's PS4 first, Wii U Pro controller second.
I like the Gamepad for streaming...but I can't stand playing games on it for long. Just feels cumbersome to me.
I've had both the 3DS and New 3DS...and though I don't find either uncomfortable, I prefer playing on a controller in general. Hard to compare though.
Never had a Vita or One, so can't compare those.
NNID: Zephyr25 / PSN: Zephyr--25 / Switch: SW-4450-3680-7334