This really is a hard one to answer. My least favorite to re-watch, definitely is the Phantom Menace. It just drags in the middle so much, and I don't like the whole child protagonist thing. I also have pretty strong quibbles with the next two prequels but they do at least entertain me. It would also be a toss up between the Last Jedi and Rise of Skywalker for me. Th latter is just bad. But the former, though I found the film entertaining even if very out of place for a star wars movie, kind of cratered the center of a trilogy and left it no real place to go to (it was like the opposite of Empire in a way, where the latter set up all this suspense about Han and where things would go, leaving you excited for the Return of the Jedi, the former ended and it almost felt like I didn't need to see the next movie). So I think with star wars it is complicated because you kind of need to weigh them in terms of are they a good or bad movie on their own, how to they serve the franchise overall, and how do they serve the trilogy they are part of. I would say on the whole, the first trilogy is the best and Empire remains, for me, the best installment. While I thought the new trilogy got off to a promising start, those last two films just ruined it for me, so as bad as the prequels are, in terms of what I would prefer to watch: first trilogy followed by second two films of the prequels. I don't think I need to see the new trilogy anymore as the whole thing just feels incoherent as a whole (though individually there is some entertaining stuff in there)