Could you be mixing this up? There was a heavil-used phrase, "OS/2 is a better Windows than Windows" during the Windows 3.0 era, because the OS/2 Windows subsystem was far more stable than Microsoft's Windows (and also - as it happens - a good deal more stable than the rest of OS/2 also).
I'm not making it up; if you google the phrase "better Unix than Unix" you'll find a number of references to these words. However, it probably wasn't a direct quote by Bill Gates, as was claimed.
