In a vacuum with only the other titles The Last Jedi is a bad title for reusing the word “Jedi” from Return of the Jedi, while The Rise of Skywalker is a good title for rhyming with Revenge of the Sith and Return of the Jedi. In actuality, The Last Jedi reflects the film’s contents rather well while The Rise of Skywalker does not.
Either way The Force Awakens works wonderfully, so I guess it’s the real winner of the Sequels.
As for in general, I think I’m gonna go with Revenge of the Sith as the best title. Elegant and describes the film well.