Which will be 2014's best-selling racer on PS4 + XB1?

[GTAexpert]

FATALITY said:
forza horizon 2 on xbox 360 driveclub on ps4. the crew will bomb

Xbox 360 isn't part of the discussion, neither the PS4 individually. Its about which game will sell most on PS4 + XB1, not individually, unless you're talking about an exclusive.