Mac:
Pro - If your disabled and only have one finger on your right hand then their mouse is perfect for you, you are apart of a community that won't shut the **** up about their products, you are on your way to being a hipster, you won't have to think for yourself as the computer does that for you, if you happen to be an artist or musician the computer will actually have value, there are little viruses as the mac population is too small.
Con - Costs more than a PC with the same specs, if you are normal and have more than an index finger on your right hand their mouse is ****ing useless, you are on a very closed OS.
Windows:
Pro - Most products will run smoothly if you obtained them legally, can be very cheap, very good for gaming, easy fixes, plenty of shortcuts, ****ing awesome mice, most people own one and can relate.
Con - If you have an IQ under 30 you might have some problems, isn't custom designed for musicians who require advanced editing to sound good, or artists who can't use any of the numerous ****ing artistic programs that work on PC, you can't act like your ****ing cool for being a part of the minority of the computer community, since everyone owns a PC there are viruses
I think I summed it up