I own the original N64 cartridge, Collector's Edition version, and 3DS cartridge. Since OoT is my favorite Zelda game ever created I don't believe that's overly excessive. The more the merrier, right?
I have the original N64 version (1.2 sadly), Master Quest on the Gamecube, and the 3DS version. For a while I mostly played the N64 version but I've recently taken to playing it on the 3DS and am currently trying to best Master Quest on it.