Here's a bit of OT.
I was a big Dune fan as a kid, but never got into the Rings series. Basically, I was a sci fi kid. I tried reading fantasy stuff, but it just never clicked with me.
So, is this common? Are there a lot of "either-or's" out there? Is "Are you a Duner or a Ringer?" a valid question?
Anyway, judging by Peter Jackson's success with Rings, he'd be a good one to take on Dune. It needs more than one movie to capture it all.