If we learn that underneath Mandalore there is a hidden paradise, it might win. Otherwise, it's only useful as a holy land to certain Mandos. It's literally been bombed into nothingness.
Though the history of the planets and their inhabitants are interesting, both planets are pretty barren wastelands with the occasional grey city when you get down to it.
It’s a pretty good matchup, because of that, because both are still beloved.
^The matchup ended with Mandalore winning by a small margin. The polls count for only the first 24 hours. You can follow the results in the comment section of the Planet Cup Home Page (I added the link – it’s located just beneath the poll itself).