Smart money’s on JRuby
Title provided by cuningjames from programming.reddit.com comments on Martin Fowler’s GroovyOrJRuby article
Eh. Sun’s chosen JRuby, funds its development, and publishes relevant development tools; JRuby is much faster than Groovy and stands to become more so; JRuby has rails; JRuby is roughly equivalent to a rather popular language designed by someone not hamstrung by [...]