If pushed I would probably say ESB is my favourite, but that doesn't mean I think the other two (yes there are only three Star Wars films) are inferior. All three are masterpieces, and very different. ESB has the best sabre fight IMO - not the most technical, but that old saying "less is more." It has a perfect balance of action and suspense without being choreographed like a music video, something modern films don't seem to get. I also like the fact it ends in stalemate.