If they actually did something new, rather than just release another game in the New Super Mario Bros.-series with the exact same look and design, then yes, a new 2D Mario would be great, but otherwise i'd rather just get Mario Maker 2.

Brand new game of course!...but, something more 'inspiring' like SMB3 was instead of the "soulless" (in my opinion) NSMB series.

I'm probably getting Mario Maker, but I'd STRONGLY prefer a real 2D Mario game. Even one in the NSMB coat.

2D Mario has nothing new to offer anymore. So... Mario Maker 2 it is.

But you also buy third party games.

I want a new 2D Mario, but NOT a New Super Mario game. As mentioned before, the art direction with the NSM_ series is bland. They need a visual rehaul with the 2D Mario series.

I’m definitely looking forward to Super Mario Maker 2, but what I’d really like to see is an ultra ambitious, visually stunning, 2D Super Mario game.

Specifically, give Mario the Donkey Kong Country: Tropical Freeze treatment.  That’d be awesome.

Mario Maker 2 if I had to pick either or. But I would definitely want a new 2D Mario, with revamped art style and new mechanics. Wouldn't mind a Rayman Legends/Origins aesthetic.

Depends. If's a New Super Mario Bros. game, I'd take Mario Maker.
If it's a genuinely new and ambitious 2D Mario game, 2D Mario.

Mario Maker 2 is the better and smarter route. 2D Mario games by themselves have felt lifeless and lacking creativity. Plus with the port of NSMB U to Switch, there's really no need for another one at all While Mario Maker 2 is 2D Mario still, its a continued fresh take that lets us keep being creative with the game and improving on it. Some of the levels on the Wii U version were insane and better than official ones made by Nintendo themselves.