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Probably Scala/Play, but I would spend time learning and using both.

Here are job trends for these languages: http://www.indeed.com/jobtrends?q=Groovy%2C+Grails%2C+Scala&...

Hmm Scala seems to be on the upswing, while Groovy/Grails seems to have stagnated.

I've heard good things about it too :) .

Play! used to use both Scala and Groovy, but v 2.0 purged itself of all its Groovy code, perhaps triggered by Grails dictator Graeme Rocher joining the Groovy despotry 4 yrs ago (he didn't leave it until a few months ago). Whereas Scala is used by more than one framework (Play!, Lift), I can't imagine anyone would use Groovy to build anything not sanctioned by the Grails crowd.

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