If I had to pick one, it would be Rogue One. Bad ass Vader. Shows extent of the sacrifices made by the rebels. I love it when the Death Star fires at low power. It's cool they got James Earl Jones to act Vader's part once again. The battle over the data center planet is great. When the rebel ship rams into one of the Imperial star destroyers what follows looks fantastic. The havoc it wreaks aboard the Imperial ship and how it destroys the station that maintains the force field.
The second best is The Empire Strikes Back. The dialogue is much better than anything written by George Lucas. Too bad Lucas didn't outsource the screenwriting to Lawrence Kasdan in The Revenge of the Sith.