From a pure conceptual perspective, which is the better "Gimmick controller", Wii U Gamepad, or Joy-Con?

[mutantsushi]

GhaudePhaede010 said:

mutantsushi said:

And all these issues were apparent from Day 1. I always failed to see value vs alternative approaches to same problems, such as "auxiliary info display". How does 2nd screen (requiring shifting visual focus) solve that any better than having modal window/view on main screen triggered by button or gyro tilt? The only potential value is in shared-screen local multiplayer re: "hidden info" but multiple WiiU 2nd displays were not well supported, making it moot. All this is at cost of hardware budget & draining system performance to drive 2nd screen. For... being able to play tethered to WiFI while you sit on toilet? OK.

The conversation here is not about execution; rather, it was made clear this conversation is about concept. Both of your paragraphs are about execution . The first paragraph starts off talking about concept, "The Wii U gamepad had some nice ideas" but ultimately breaks down to a conversation about execution which, in this case, is off the topic.

What changes in technical detail/execution do you think avoid those issues?
I can't imagine any, which is why I frame those as pertaining to concept itself.
My comment re: Switch addresses 3in1 (or 2.5in1+portable) concept,
which is humble but that doesn't prevent it being successful, it's implementation just has to not get in way.