For me its Visions Ronin. The entire episode from start to finish. Its feels like if Kurosawa made Star Wars.
The idea a Sith can be a good guy or at least morally grey is very outside the box from the idea of George Lucas good guys and bad guys, and good guys use blue and green, bad guys use red.
The idea of good Sith and Evil Jedi is only hinted in EU in things like the OLD Republic MMO.
The only other example I can think of is the Kotor comic where the masters commit murder and frame a padawan. Zayne Carrick.
Ronin is cool but I don’t think he’s supposed to be a good guy, and the idea of Good Sith is lame. It’s very much in the box for people who believe in gray jedi, balance in the force means equal light side and dark side, etc. which is a large part of the fans.
The Acolyte is another prominent example recently.