After digging into both, I'm moving towards GWTEventservice: 
http://code.google.com/p/gwteventservice/.

RequestFactory seems best fitted to CRUD operations on specific model 
entities and does offer much "under the covers" in supporting those 
operations.  Combined with UIBinder and Editors, it's pretty painless 
creating small-scale, simple apps.  For large-scale projects, IMHO, *far *too 
much scaffolding code just to move POJOs back and forth.  It was also a bit 
of a pain getting integrated with Spring and Guice, though I'm sure that 
pain will be alleviated as the releases progress.

http://code.google.com/p/spring4gwt/ -- this may be of interest if you're 
Spring-based.  May be of interest even if not. :-)

If you're dealing with one application, particularly a small one, I'd go 
with RequestFactory.  I have to deal with 6 rather large applications, with 
5 different databases.  Even though I don't use any two at the same time 
(JTA), I'm finding neither Guice Persist nor RequestFactory really fits well 
and failover is still problematic.  As a result, I find it best to simply 
push POJO events back and forth between the UI and the Server.  SOC for me.

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