To be honest: I don't even know another framework like GWT that match my desired setup ... Do they even exists? So it's like comparing peers and bananas...
My setup (which I love).. A separate backend (Spring) and frontend (GWT), that are deployed separately in respectively Tomcat and Apache httpd.
A few nice things:
1) Separate development of backend and front end.
2) Separate teams for backend and frontend (RPC communication through contract interfaces). Overcomes unncessary dependencies that slows down development... As such: fast development, changes and bug solving...
3) Fast startup of dev mode due to noserver mode (no need for gwt yetty/tomcat).
4) Full control/inside of communication between backend and front-end, that leads to easy performance optimization.
etc...
Which frameworks can offer this?
Note: before I also had both frontend and backend in one war, which is ok for smaller projects, or if it's required by the client environment, but the separation of frontend and backend works very nice...