This is honestly a hard question in some ways. TLJ is undoubtedly the more focused, the more thematically advanced, the better produced film. It's beautiful, and bold, and new.
However... it's also a hugely dissatisfying, disrespectful, destructive film. It's out of place, and it seems to go out of its way to destroy the conventions we've relied upon for 7 movies... with only one movie left to go. Its artistic choices are bold, but really unpleasant. It dumped on a lot of the lore, IMO.
Rise of Skywalker, on the other hand, is trying its best to be a pleasure-box... it's job is to throw as much candy our way, so that we don't notice all the craziness and absurdity that is going on in the background. It's really hard to divorce this film from its context. This is a rushed, pieced together puzzle book of a movie, because the creative team saw what TLJ gave them, and they chose to lean away from it, rather than lean in. TROS is the more fun film... easier to watch... turn off your head, and enjoy the nostalgia train. But pay attention to the details, and man is it a mess.
So..... look, I dunno. I don't know which one is better or worse. I know that I enjoy TROS more. But they are both disappointments. Truly. It's a frustrating thing, honestly. On day 1, after they decided to do this sequel trilogy....someone MUST have told the creative team that, "hey, the principle worry is that we degrade the victory of the originals. We should be respectful not to destroy the existing canon set up by the originals and the prequels." In essence, the principle challenge of this sequel series was to prove why it was truly necessary. And they didn't meet that metric, IMO. Is the resolution of TROS any more profound or lasting than the resolution that we got in ROTJ? I'd argue no. This... oddly... feels like a step back. And that's really discouraging. Ultimately, I have to begrudgingly side with those who say that these flaws got baked into the cake, the second they decided to exile Luke in TFA. That creative choice... to essentially waste a movie recreating the beat for beat plot points of ANH... is basically what set this trilogy up for failure. And it's a true shame. You have to work pretty hard to make me disinterested in Star Wars, boy.