Ruby's a top ten language -- neither Scala nor Groovy are anywhere near it -- so the ecosystem's much bigger. If we need JVM libraries, we can use JRuby without

Ruby's a top ten language -- neither Scala nor Groovy are anywhere near it -- so the ecosystem's much bigger. If we need JVM libraries, we can use JRuby without changing any source. Admittedly, Scala's performance is faster because it's statically compiled, while Groovy's syntax is more standard, i.e. closer to C/C++/Java/C#/Javascript/etc. So wrt (1), Groovy, (2), Ruby, and (3), Scala.