With optional static typing you can pretty much pick and choose the best mode for each part of your application, which for me seems like nirvana. Even with static typing enabled, I find the syntax more concise and productive in Groovy than I do with Scala (I'm more experienced with Groovy so there's a lot of bias in that though).
The static compilation added in Groovy 2 is much faster than dynamically-compiled code but is still buggy e.g. http://stackoverflow.com/questions/14774709/groovy-2-1-0-wei.... It was written by one developer, and first shipped in Grails only 2 months ago, which doesn't even seem to use the static compilation features (correct me if I'm wrong). Let the Groovy/Grails developers eat their own dogfood first before recommending Groovy's static compilation to others.