The story of Kamiwaga was more like a "one-shot", too small when a true setting should be like a sandbox.
Ilkoria has got a lot of "kaijus" or gargatuan monsters perfect for some crossover with a no-D&D franchise (dinobots, dino power rangers, Ultraman)... but it is not the best setting for low level PCs. Maybe if there is a module of optional rules about tamed monster pets then the things would be different.
Innistrad is the best option for the no-MtG fandom. It allows a lot of open space to add elements when Ravenloft is too "small", for example fights among supernatural factions (vampire clans, theriantropes tribes, dark fae courts, witch covents, wraith guilds, monster-hunter brotherhoods...)
About Ixalan my opinion is the morrion is a fashion accesory too cool and fabulous to be only wore by the bad guys. I reclaim a positive discrimination quota of morrion-wearers in the band of the good and nice characters.