Interesting choice, the Milgauss as you know is no longer in production so certainly makes a nice collectible and from what I've seen a few really nice ones do turn up and they tend to be cheaper than the GV models.
The Apollo 11 35th anniversary Speedmaster is an absolute stunner, but these days would probably be double the price of the Milgauss. Some people buy the dial and hands and convert a normal moon watch and that is of course the cheaper option for the same look.
Not convinced about the Omega Olympic releases and I don't think moving them to 2021 or whenever will make any difference to value, so personally I would discount this particular watch.
That leaves two, both no longer made and both collectible, but one is much dearer than the other. Five years ago it was the other way round. You can't really lose with either of these, just a case of how much you want to spend.
Do I have a favourite here? The Apollo 11 by a long distance.