StrataFrame Or CSLA.NET, Which Framework Would You Use?

If you would have to choose between StrataFrame or CSLA.NET, which one would you pick?
The team I am part of at work is trying to pick a framework for new development and they like these two the best. Are these two something you would pick or do you know a better one?

CSLA.NET: http://www.lhotka.net/cslanet/
StrataFrame: http://www.strataframe.net/

Also keep in mind that while CSLA.NET is free, StrataFrame is not.