I'd say the Na'vi River Journey sounds vastly superior to Hogwarts Express - but the sets/AAs make it more fully fleshed-out IMO. Flight of Passage could be about on par with Gringotts if it actually does vastly improve on the Soarin'-style ride system/format.
While Gringotts is probably more ambitious than either, Pandora has a stronger overall lineup. The speedbike coaster similar to TRON in Shanghai and a walkthrough maze would have pushed it over the edge - neither are in the cards :blank:. The lands themselves will probably be about equal, though.
Plus, unlike USF, AK needs indoor, air conditioned rides/attractions since there's only 4 in the entire park
(3 shows and one of the scariest rides at WDW) while USF is practically all indoor attractions except for KidZone, Rockit and Kang/Kodos.
At the worst, I'd expect Pandora to be the best 2017 addition (if only a solid one) to Orlando. Volcano Bay will probably be solid, too, while Fallon screams so-so to me.