Migrating DVR from Mac to Windows/NAS/Linux/etc?

Just curious why people are migrating away from an Apple Mac to another platform?
I've never owned one, or an ATV, but have iPads, iPhones and iPods in addition to Windows and NAS's.
Why would someone want to move from a Mac to a Windows/NAS/Linux/etc platform?

It's just a matter of preference. I think @smswings14 wanted to use a more powerful nvidia GPU for multiple remote transcodes, for instance.

@tmm1 is correct on why I'm doing it. I'm still migrating everything over and expect the migration to take another day because I'm only going over network gig speed instead of usb 3 or greater. 4TB of video takes a long time to move over I've found.