If you can get tickets see The Great Comet, this is coming from someone who is taking a massive trip in November and seeing The Great Comet, DEH and Falsettos and although I am super excited for all three, I CANNOT WAIT to see The Great Comet mostly for the incredible performances to come (Denee Benton looks fantastic!) and the inventive staging. My second choice is Falsettos based solely on the cast and score, which is amazing, and then knowing very little about DEH is third, but still excited to see all three regardless!
I would also say to skip Fiddler, especially if you want to see something that will not tour.