I have only seen four: The Prestige, Inception, Dunkirk, and Oppenheimer. Probably just recency bias, but I did really like Oppenheimer.
How have you somehow not seen The Dark Knight trilogy?
Superhero movies have just never been my thing. I was on a long distance bus ride once where The Dark Knight was playing, but you had to ask for headphones to listen in, and I just listened to my own music instead. I didn't see anything to really make me interested in watching it again with sound. I did see Joker, though, as well as the Lego Batman Movie, so those two comprise all Batman lore in my mind.
Fwiw, I've also never seen any of the Avengers movies, and the only Marvel movies I've seen were the first two Tobey Maguire Spider-Man movies.