How have you actually switched from Ubuntu when Mint is based on Ubuntu? I see these statements all the time and the self-deception is mind boggling.
Mint comes with slightly different, as well as Mint-developed, apps pre-installed and no snaps. They have different installers and Mint is a bit easier to manage, especially for newer users, though that wasn't a major factor for me as I have 30+ years as a Unix(ish) admin.
As for Ubuntu, I used it up to version 18.4 but soured when Canonical started pushing snaps, and delivering some apps only as snaps (like Firefox, Emacs) -- w/o having to resort to PPAs to get the packaged versions. While I'm not a huge fan of Snap (or others, like Flatpak) I really don't like being *forced* to use them and I probably would have stayed with Ubuntu if they had left it as a choice.
Also, extending your logic, one might ask how running Ubuntu is not actually Debian as the former derives from the latter, but there are obvious differences, as there are with Mint and Ubuntu.