[stinos]

VS has the best debugger

Yes and no :P Afaik gdb can for particular languages do everything the VS debugger can do, even more (or so I heard once), but the major and utterly important difference is the fact the VS debugger comes with the IDE and the 'I' in the word makes it so much easier to use than anything else out there that usually you can get a lot done with it in a much shorter timespan than with other debuggers. And as such gives people the right to call it the best debugger, imo.

[yoklov]

Still takes a lot less time to use VS than to use the XCode debugger IMO. Having to expand anon struct/union members makes debugging in some codebases a real pain.

[beached_whale]

Not sure if available in XCode or GDB, but the ability to tell VS debugger how to display custom structures is very useful