If I owned a mac, I would go back to a Windows system as soon as possible, because once you start using macs, you begin to forfeit over thousands of dollars to some corporate douche bag named Steve Jobs so you can have a rainbow colored desktop and hidden files used to collect your personal information. Windows may be bad but OSX is just the worst. At least with Windows, most of the people that use it can identify everything wrong with it whereas Mac users fight to the death to defend their precious Apple and Steve Jobs while ignoring every negative detail of the company and everything related to it.
As for the 2nd question, I do have a PC, as does every Mac owner and again I would never consider a Mac.
I think linux is pretty good if you know how to use it but in my current situation I have to use Windows.