Lessee, that movie with all the cool drug induced sequences at the end (not by Mr Clarke, but the guys who made the movie),
versus Patrick Stewart yelling 'Atomics!'
Yeah, for entertainment factor, I'm going with Dune. 2001 is good hard sci fi (to a point), which showed us what an orbital station, etc. might look like, but Dune has psionics, sandworms, dueling houses...
Something for the detractors to consider. The movie very likely attracted a lot of interest in Herbert's books, which is good for the Herbert Franchise. And, as I've said before, David Lynch had a LOT of concepts to cram into a single 2 hour+ movie, and didn't have a sequel in mind, so I think his interpretation hit upon a lot of the finer points all things considering.
The efforts that came afterwords, while more true to the 'script' put forward by the books, did drag on at times...
I enjoyed 2010 more than 2001, simply for the replayability factor. Roy Scheider and the gang made a very enjoyable movie, with no funky drug induced sequences to pass the time. Of course, the kaleidoscope effects of 2001 do appeal to some... so while I do enjoy 2001, it's not a movie I feel the need to rewatch over and over.