My PC is well out of date, I haven't upgraded it in well over 5 years. It gets the job done. It's Windows because it gives me the most options.
I don't use Linux because I don't like it.
I don't use a Mac because I can cheaply upgrade this PC whenever I like and not worry too much about it.
I use my Amiga for games and for laughing at how bad my Dpaint art is from 15 years ago.