If you have not used Visual Studio before, then QtCreator is more than adequate.

But if you day job is designing Windows applications, or you are applying for jobs in that sector, then yes, you will obviously need to know Visual Studio, as it's the de facto standard for developing applications for Windows.

As for an ethusiast just doing Windows coding in there spare time, Qt Creator is more suited.

As for the original question, I use Visual Studio, but only because I use it daily at work too.