Project Cars 2 or Gran Turismo Sport for PS4?

The title says it all, I wanted to buy a more simulation-heavy racing game for the PS4, Project Cars and GT Sport convinced me most, I didn't like Assetto Corsa because I heard that the game only runs at 30fps. My question now is which game should I buy?!

Would rather recommend Gran Turismo.

Project Cars 2 is a bit more realistic, but has a pretty lousy A.I. Which makes playing in single player very frustrating.