Personally, I’m not the biggest fan of Debian’s and by extension Ubuntu’s development and distribution model. That being said, it’s my personal preference, and not an objective judgement on quality.
Mint doesn’t really have any features that make it especially interesting for advanced users that it doesn’t inherit from Ubuntu or by extension Debian. Or does it?
Again, not trying to shit on it or anything, but Mint’s goal was always to create an easy distribution, which is no small feat. But this is nothing I’d associate with “advanced users”.