I believe that on PC, that AC is thought to have a slightly better physics model, while pCars looks better out of the box. I tend to agree, although I enjoy driving both. Also, there is a large number of community mods for AC. No idea if this translates to the PS4.
Personally, I went bonkers on racing sims after burning out by 10 years of flying in squads. Now back to flight sims. Toward the end of my time racing, I discovered Richard Burns Rally, and learned that there is a whole other art to driving fast that you don’t really pickup racing on asphalt. Thankfully, Dirt Rally brings some of that, plus Rally Cross, which is huge fun because it combines asphalt and dirt on a closed course.
I’ve tried to do both, but I also like playing guitar, play in a lacrosse league, assistant youth lacrosse coach, fly drones, rent a Cessna once in a while, and involved in two businesses.
Then there are the kids (3 x girls), which we put off until the last possible moment. Claudia says plan on working until I’m 70. So with only 24 hours in a day, as much as I really love driving a race car, my simming time has to be somewhat focused.
More or less it’s been DCS, IL2 BOS, and carrier ops in P3D lately. Although, that Les Paul hanging on the wall has been giving me huge gilt trips lately 
And I spend too much on this site! MUDSPIKE = sim crack.