Smart GWT is a GWT-based framework that allows you to not only utilize its comprehensive widget library for your application UI, but also tie these widgets in with your server-side for data management
The UiBinder framework allows you to build your apps as HTML pages with GWT widgets sprinkled throughout them.
|Much more sophisticated||
"While smartgwt has much more sophisticated widgets than gwt you still can t use uibinder in conjunction with it which is why i rejected using smartgwt"
from question "GWT,Smart GWT,GWT-ext comparison"