I'm using both regularly now.
Visual studio is easier and more user friendly. I have issues with it though. They force you to do a number of things for reasons the benefit Microsoft and not you. It's free so you can't complain that much. Support is non existent but there's google for help.
Eclipse Gallileo does some difficult things startlingly well, but does some simple stuff startlingly badly. Such as when you compile if there's an error you get no visual indication. You have to open the problems window to see the errors. DOH! Eclipse is nearly as good as visual studio overall and is one of the best when using linux. The new version of the debugger has some very nice new features as well. Support is poor to non existent but there's google for help.
I tried codeblocks. The support was not very good to rude. I found it difficult to do anything serious with.