Windows is Gillette Mach3.
Expensive, you have to use the same thing over and over again. The makers tell you its the best there is, but thats not necessarily true.
Linux is DE shaving.
Its cheaper, very customisable, you can have any combination of products. You use it to enjoy the experience.
MacOS is a Gillette Aristocrat.
Does the same as other DE razors, but is a lot more expensive so you can tell people how much better it is than their razor. It just works.