I have liked the Dark Times comics about Vader, The first and second of the Marvel series and Doctor Aphra.
The Dark Times ones are no longer canon. I would be lying i i said i wouldn’t watch a high budget Darth Vader a Star Wars movie film. But i just don’t see the point. The character has been overused in the old EU and New EU. While there is a lot of unexplored areas of the Star Wars universe and new worlds and characters, in a far future or far past setting they could do movies about without having to go back to the OT or the prequels to draw on.
They should do more non Jedi and Sith stuff, but they also should due a series about the dawn of the jedi and the beginnings of the Sith. They don’t have to be beholden to the Kotor games, the Old republic or tales of the jedi because non it is canon.
Vader has been explored, but a Luke Skywalker Jedi teacher series on Disney Plus set between episodes VI and VII is unexplored. And Lucasfilm could use de-aging tech and have Mark Hamill do it.
Anyway who would they cast as Vader. Would they show Vader in his chamber with his mask off all scarred and stuff with Hayden in heavy makeup. Like some fans want. It would be cheaper to use some random and put them in the suit and in closeups without the mask and in makeup.
Anyway i have no idea what Lucasfilm’s plans are but i do think at some point Vader will show up in a future season of Obi Wan if there are more than one, or the Mandalorian. More cameos. Like Rogue One, and the animated rebels.