Of course, one could just as easily say about Empire...
As good as it was, how can a fairy tale with Ice Planets compare to Inigo Montoya finally catching up with his father's killer and exacting his lifelong dream of revenge. Princess Bride all the way.
I'd put the goosebumps I get when Inigo finally catches up with Count Rugen up against those created by Yoda on Dagobah any day of the week. I suppose it ultimately comes down to whether you prefer fantasy stories set in a medieval setting or a futuristic setting.
Besides, with Princess Bride we are talking about one of the most quotable movies of all time. As good as Empire was, I don't exactly hear it being quote nearly as often or with the number of quotable lines as its competition. Empire is the best of the Star Wars films by far (it's the only one I like) but that's as far as I'm willing to go with it.