I think it depends a lot on what you expect from your IDE and whether you're spending money or not.
If you're ok launching GWT DevMode "manually" (through Maven, Ant or Gradle, or creating your IDE launch configuration by hand), and debugging your code in the browser (rather than the IDE), then any IDE would work.
If you don't care about JSNI syntax highlighting and autocompletion, then any Java IDE could work (including, e.g., IntelliJ IDEA Community Edition). You should avoid JSNI nowadays anyway, but might still have some in existing projects.
Similarly if you don't care about a UiBinder-specific editor (any XML editor would work then).
Otherwise, you won't have many choices to begin with: the free Eclipse + GWT Plugin, or the paid IntelliJ IDEA Ultimate Edition.
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