I think Revenge of the Sith might be better than The Last Jedi, but I also don't think Last Jedi really works. In a vacuum it's a decent movie -- not great, because just about every part of the Canto Bight plotline is bad and feels like it fell out a separate movie -- but it didn't really go anywhere interesting or do anything new for Star Wars (not suggesting that the other films did either; I just see that mentioned as a plus for the Last Jedi and it's never made sense to me). Rian Johnson is a very good filmmaker but I think it's his worst film.
With that said, The Force Awakens is a large part of The Last Jedi's problem. It gave him almost nothing to work with; that movie set up the rest of the trilogy to fail by resetting the galaxy to the original movies. There just wasn't much room to do anything interesting from that starting point. If anyone deserves the lion's share of the blame for the overall failure of the sequel trilogy, it's JJ Abrams.
I think the prequel trilogy is a lot more interesting (not the same as saying they're better) than the sequel trilogy. The movies are worse from a filmmaking standpoint for the most part (the scripts and direction are quite bad) but they're bad in an interesting way. The underlying plots are honestly pretty good, and there's an alternate universe where the prequels are excellent films because Lucas let other talented people direct the movies and write the scripts based off of his plot treatments. The sequel trilogy is generally well made but in a bland, mostly directionless way. For better or worse, the prequels are very much the artistic output of a single visionary with all the good and bad that entails. The sequels feel more like something put together by a corporate committee.