I probably gravitate towards the Guns N Roses version....it's the one I hear the most. But I also like the rawness of Dylan's original.
http://en.wikipedia.org/wiki/Knockin...eaven%27s_Door
It's been covered by A LOT of artists. It's an okay song, maybe I would like it more if it wasn't played so much? It's certainly not a good representation of Dylan's long and amazing career.

So, on that note, it is one of Guns N Roses better songs, which says a lot about how much they suck. So yeah, I think I prefer the Axl Rose version.