Emacs's mouse cut+paste interface is vastly better than the standard windows one. For one, you don't have to use the keyboard. The scroll bars are also vastly better (assuming you compile with Athena-style scroll bars).

As for IDE features, at work we use Visual Studio. Autocomplete and parameter information are nice... when they work, which is about 50% of the time. Emacs (with etags) is better at jumping to definitions than Visual Studio is. It also indents code correctly (something no editor I've ever seen, including vim with :set ci, does half as well). So I use emacs in cygwin, and only use V. Studio to compile (and for its debugger, which is actually extremely good).