People nowadays minds' are set into thinking that if you're buying a PC, Microsoft has to also be installed together to make a perfect PC. Really?
The first comparison is 'your pocket' aspect. Linux is free, whereas Microsoft is not free. That's an advantage.
The second thing is basically Linux kind of works the same as Microsoft for some purposes. For a PC that's only used to access Facebook, Twitter, or mails? It works. For PC that's only used to decorate your room because you never use it anyway? That also works perfectly.
In fact, if you just try to understand how Linux works and just set the comparison aside, it is also a perfect working partner. Have fun trying to figure it out!