Been a MS user for decades. We run our TV/Home Theater through a Win7 desktop (Win Media Center for OTA TV/PVR, internet streaming, etc.). I have a Toshiba laptop with Win7 that is getting so sluggish I will have to reimage it. I have an older Toshiba laptop that hums along with Ubuntu 13.04. It would no longer run Vista, no matter how many times I reimaged the machine. With Ubuntu it does everything I ask of it. I often forget that I am using it instead of my Win7 laptop. It is very stable. I love it.
DW has been a Mac user for years, so I recently got a MacBook Air. I am working through the learning curve, which for some reason seems steeper on the Mac than it was with Ubuntu. I just don't understand the Mac file system. It is so hard to find files and to work through a path to open them.
Anyway. I find all three systems to be perfectly satisfactory, when they are working properly. In my experience, Windows is less stable and requires more maintenance than the other two, but it works great.
I am looking forward to the launch of Ubuntu 14.04. I have resisted updating to 13.10, since the new version is supposed to be superior. Thanks for starting this thread. I get so amused by the emotional responses when one person touts OS "A" and someone else has to tell him all the reasons why he is wrong and OS "B" is far superior. I enjoy using them all and learning their differences and similarities.