What is your favourite Ruby interpreter and in what OS? What's the reason.

Question

Ruby, JRuby, mruby, InstantRuby, or what?

Answer 1

Regular Ruby, which is also known as MRI (Matz Ruby Interpreter).

Why?

Because it's the reference implementation of the Ruby language.

It's the one that's going to get the newest features first.

It's also going to support the most Ruby gems

The OS?

Ubuntu.

Because it's a well supported distro & Ruby runs great on Linux.