Stay with ubuntu unless you have an issue with ubuntu itself, because the grass isn't greener on the other side despite what some people might say. The only real difference that you'll find are different default settings/programs and the time it takes for a software update to reach your final linux install.

Some distros like Ubuntu prefer slightly older versions that have been proven to be stable/bug free while others like Arch mostly go for the newest everything where available, at the cost of stability. If you like something a little bit more balanced, you have Fedora (which is my preference).

The beauty of Linux is that most software will work no matter the distribution you use. If the reason you want to use Linux Mint instead of regular Ubuntu is the desktop environment, you can at any time install the Cinammon desktop (the one used by Mint), here's an article that guides you through the process: https://itsfoss.com/install-cinnamon-on-ubuntu/