I am beginning development on a new AppEngine application using Groovy. It will be medium-sized and use a number of AppEngine services. It will have both a regular and a mobile website, using HTML 5 and JQuery.
Which of the two frameworks suits my case best? And why?
With Graeme (Grails project lead), we looked recently into making the latest Grails run again in App Engine, and we stumbled across some OpenJDK bugs that prevent the latest Grails from even starting on App Engine. So till those issues are resolved, and we are able to resolve other potential issues that may arise, recent Grails versions won't run properly, if at all, on App Engine. So Gaelyk seems to be the sole "Groovy" option on App Engine for now.