Pierre-Loïc

I'd say it is generally preferable to have either rvm or rbenv installed on your machine, but not both.
If you want to make the switch to rbenv, you'll find articles or gists on your favorite search engine such as https://dev.to/krtb/why-and-how-i-replaced-rvm-with-rbenv-23ad or https://gist.github.com/traumverloren/fa5c30056319992c4dab