I'm a big fan of JRuby for two notable reasons. First, JRuby runs on the JVM, which is arguably the most mature and tested VM on the market today; second, you can leverage both the Ruby and Java ecosystems without any additional overhead (the Java interop is almost seamless).
Being able to write classes in Java (or Mirah) where speed is crucial, and use them from within JRuby without having to do any additional work, is a nice bonus as well.
The only downside is startup time, but that's been improving a lot recently.
Being able to write classes in Java (or Mirah) where speed is crucial, and use them from within JRuby without having to do any additional work, is a nice bonus as well.
The only downside is startup time, but that's been improving a lot recently.