I like both, but having rewatched them recently, I don't think either held up as well as I'd hoped. Highlander is primarily an accomplishment of mood and performances, but it has a silly and underdeveloped script.
And having just read The Neverending Story for the first time, I finally understand why the author hated this movie adaptation so much. To be fair, though, it's a hard book to adapt. I highly recommend it if you've never read it.