Duel of the fates, the soundtrack helps a lot
Visually, you cannot beat the Darth/Luke battle scene in the carbonite freezing chamber in ESB… it is like art. The orange and the blue are so beautiful
The final space battle in Rogue One, old school moustaches and all
Vader’s scene at the end of Rogue One.
There are so many good ones but here are a couple that came to mind when I saw this question:
From RotJ: “Never. I’ll never turn to the dark side. You’ve failed, your highness. I am a Jedi, like my father before me.”
From ESB: “I don’t believe it!” “That is why you fail.” plus Yoda’s “luminous beings” speech.
From Andor: Kino Loy’s “one way out” monologue over the intercom during the prison break.