Just got a PS4 - What JRPG should I get?

[Azuren]

Well, first of all, NieR and MHW aren't JRPGs.

Ni no Kuni 2 is fantastic. There's just nothing absolutely awful about the game aside from its own intent from the beginning of the game to undermine the world map with instant-travel.

Persona 5 is a great point to jump on the SMT bandwagon, and will somewhat mentally prepare you for SMTV (somewhat... Maybe a bit.) Be wary, though, as it is at the minimum a 60 hour game.