If you want my two cents, Mint's default Desktop Environment (Cinnamon) is far more windows-like compared to Ubuntu, and Mint includes more quality of life applications for less tech savvy people compared to Ubuntu out of the box. (Mainly graphical apps for updates, backups, disk management, etc...)
I first tried Ubuntu when I was starting my Linux journey, but it didn't really click until I used Mint. Save yourself some pain and go for Mint first :)
Edit: Also, Ubuntu contains ads for things like their "Ubuntu Pro" update service, and they're known to commit some tomfuckery when it comes to installing apps and compatibility (see Snap Controversy)