UncleScrooge on 14 September 2013
In terms of pure graphics / technical accomplishments:
Forza 5 > DriveClub > Gran Turismo 6
In terms of "looking interesting / lively":
Driveclub > Forza 5 > Gran Turismo 6
In terms of most accurate simulation (probably):
Gran Turismo 6 > Forza 5 >>> DriveClub
So yeah, there is no clear winner for me. It just boils down to what you prefer.
