Lift/Scala is getting a lot of attention lately. Having worked with Grails in the past (and finding it quite handy BTW), I\'d like to know if there\'s anyone who has tried both
Take as a fact that Lift is hard to start with (Docs could be better, not enough paradigms) and Scala too. Anyways it's not rails-easy but IMO it pays off long-term. I agree with dpp's answer, just wanted to add seven things
If you're building a CRUD app and you're comfortable with Grails, then stick with it.
If any of the following things are priorities for you, then Lift is going to be better:
Net-net, Lift is not another me-too MVC framework. It's something different and something better.
Grails is a very powerful framework with much more uptake than Lift.
I also feel that Groovy is much easier to learn than Scala.
Lift is not more secure than Grails
Lift may be faster than Grails (maybe, I haven't tested this)
You are not precluded from using Ajax, Comet or ORMs other than Hibernate with Grails
Check out the plugins available for the Grails framework for more info:
http://grails.org/plugins/
While this compares a different basket of fruit, I think you may enjoy David Pollak's ("Lift creator") response: Why would I use Scala/Lift over Java/Spring?
One thing to remember about Lift is that it is a continuation-based framework.