This is the real answer. I'm tired of people comparing Linux and Windows, they're based on completely different philosophies and design styles, it's truly apples vs oranges.
But as the GP said : you can always use both, and there are a lot of ways to do so. A few games and softwares I use can't run on Linux so I keep a windows on dual-boot. WLS 2 is a great experience for a lot of folks, etc.