So the HWP enclosure:
- is larger than the others (wolverines have very large territories in the wild)
- has good viewing
- has a large naturalistic pool (wolverines are good swimmers)
- gives the wolverines access to the tall trees (wolverines are good climbers)
- has dense ground vegetation
- has a separation area
- and the Scottish highlands where it is located more closely resembles the animal's natural habitat.
I've never seen a wolverine enclosure in person, but going off the points listed above I don't know why anyone would vote for any of the others* if they were voting for the
best enclosure (rather than their favourite one or just one that they've seen).
*not that the rest aren't good quality.