I love fish and have happily been using it for years. Every time it comes up here, though, someone inevitably will complain about compatibility - and I will admit that RVM, for instance, has definitely caused me problems with fish in the past. I guess it depends quite a lot on your particular usage and requirements.

I never got RVM working with fish; unsurprising, seeing as it’s 20k lines of bash. rbenv works well though (with one additional conf line), and chruby was working on support last time I checked.

There's a wrapper to get RVM working with fish, in case it matters to you now; details here: https://rvm.io/integration/fish

Doesn’t matter now :) rbenv does everything I need in a lighter package.

RVM is pretty heavyweight. Why not something like chruby?

I started using RVM when it was the only (possibly well-known?) game in town, and never switched until I started using fish and found that it didn’t work.

I like the autocompletion of fish, isn't there a way to get this in bash?