Anything Apple
Why?
I don't like OS X (It's locked down to Apple Hardware)
I want to build my own PC from brands of components that I choose not Apple
I don't like iOS (Super locked down, and It's locked down to Apple hardware)
Yes I know you can gain root access on iOS, but that can be a real pain in the ass to do and updates become a pain.
Yes I know you can do a hackintosh, but that's a pain in the ass, hardware selection is a lot slimmer and just the fact you OS X was never built to be run on non-mac components, so it's a bit of a hack as the name implies. Even then though if OS X wasn't locked down to Apple hardware, I would still choose Linux and Windows over OS X as Linux is more configurable and Windows has better software support.
TL;DR Apple is too closed off for me
Prebuilt desktop PC's
I would rather build it myself.