Linux is the Fiat of operating systems, it's fun when it's not broken. Eventually, though you'll get fed up and get something better.
Windows NT is a 1964 Mercury Monterey, it's big beyond big and a real waste of our resources. It makes a lot of noise, though.
MS-DOS is a Tyco slot racer. It's a silly toy that takes you around and around in circles.
MacOS is one of those talking cars. Some people think they're neat. The rest of us want to break them.
Emacs is a M1A1 Abrams tank. Ok, so Emacs isn't really an OS and an Abrams isn't a car, but they're both close and they're both BIG.
AIX is a mail truck. When you're using it you keep wondering why the hell everything is this backwards!
OS/2 is one of those 3 cylinder Geo jobbies. People who use 'em brag about how damn efficient they are. The rest of us think they should get real.
VMS is a Volkswagon Beetle. When you see 'em you turn, punch your friend in the arm and laugh. The strange thing is, you still see them around!
AmigaDOS is a DeLorean. Sure it's pretty slick and all, but they're just not made anymore.