Always thought you were a snob.For me it's more a matter of free vs paid software.
I started out with vBulletin so the transition to xenForo seemed natural for me. As a result I have never been overly fond of Invision based boards. They just feel clunky. I know people who use Invision love it, but for me they just don't feel as intuitive as a xenForo forum does.
It's entirely a matter of personal preference.