Mac OS X vs Windows. This subject is talked to death on a daily basis, but what really sets them apart? Given that the only way to buy a Mac is to pay a premium to Apple as opposed to Windows being offered by multiple providers, one can see why Windows has the majority of the market. Even so, if you follow the trend these days, you will notice the Mac OS is eating away little chunks of the market month by month, with 10% being within sight. But why should you buy an expensive Mac over a Windows PC? Aside from the usual list of pros and cons, one major factor is overlooked by many: its resell value.