On a scale of realism from lowest to highest, this it the general consensus give or take due to personal preference:
Driveclub – Forza/GT – Project Cars – iRacing/Asseto Corsa
I’m personally finding it surprisingly forgiving giving its sim reputation. The fact it focuses on racing cars means to you get a lot of high downforce cars that handle the road very well but are rewarding to drive. I’ve played a lot of Forza and that game was always challenging because of the cars tendency to be extremely tail happy (without assists) almost to the point of exageration. The step up isn’t as much as I expected going to Project Cars but I don’t think it’s as well setup for the controller as Forza which has always been exceptional in that regard, so there is an extra layer to consider as the controls might make it harder than the physics would dictate. On a wheel though its top notch.