Both! However, I think that Nintendo needs to take the Octopath approach and put a spin on sprite art! The original NES trilogy looks far more appealing than the bland, plastic look of the New SMB series! It isn't even just the art style, though. The NSMB games, though well made, simply aren't as fun as the old games. If they could figure out a way to do justice to the old games with a new art style, or a spin on the old style, that would be the way to go!
But I definitely want them to make Mario Maker!