I use Debian myself, but you may want to stick with Ubuntu if you're unsure about it (Ubuntu has more up-to-date versions of things and if you run into trouble, you'll have more support). Just one thing though, if you're wondering which version, go with an "LTS" (Long Term Support) version. While you should be upgrading your distro when you can, if you choose not to the LTS versions keep their packages available for much longer, so you won't be left high and dry. The latest version (Ubuntu 20.04 LTS) is an LTS version, so you should be good to go :)