Well... I've got 200+ hours of gameplay on project cars and I'm playing assetto corsa since 2 days now with the day one patch.
Physics, FFB and sounds.
I really liked the sounds of Pcars, but those of Assetto are a step above for me,and in online you don't hear the sound cuts like in Pcars.
Physics and FFB... It's more natural driving on assetto, catch-up a Drift is more natural and easy than in Pcars.
And FFB, yes,Pcars have a huge amount of options..but it isn't on the level of detail that the FFB hives in assetto, and the best off all that you don't need hours to configure it.
Tracks...
In quantity it's a win for project cars, it have a lot of good an nice tracks! But on the quality site those of Assetto are top thanks to the laser scan..it's just amazing how much detail they have and the FFB you receive from them.
They are also lot more accurate than those of project C.A.R.S..monza and nurburgring specially!
IU
For me another win for assetto... His IU is simple, intuitive and fast! The one of project is more complex.. But that's just an personal opinion.
AI
Till today i really liked the AI of project C.A.R.S (not in open wheel) they are fast and agresif.
But they cut the track limits to often.
The AI of Assetto isn't so agresif than those of Pcars, but they defend position and are also fighting back.. They don't cut the track and are really fast, but the should have some more mistakes in my opinion.
I realy like the AI of both games.
Carreer mode
The Carreer mode of project C.A.R.S try to replicate lot of real championships, and it's great! I really love the endurance races.
And it's a huge amount of hours to complete it.
Assetto's one is different.. With a medal system to unlock other races.. It's fun and then the special events are also challenging.
But i still have some preference on the Pcars Carreer.
Graphics..
Mmmmmm.. Yes,Assetto hasn't got the same level of graphics than Pcars.
But it have less motion blur making them more sharper, i find them good and in illumination i find assetto more realistic in day time.
Pcars is eye-catching and globally is better than assetto but those two points i put above i find them better in assetto.
Climate...
No doubts...here Pcars wins,assetto is only on dry surfaces.
Options...
In That point Pcars is better, it have the same of the PC version, UDP apps, seat and FoV settings, button mapping and go on.
In assetto the buttons are presets and FoV option are limited, not a real good HUD, no UDP apps..but it's just the beginning of the game, so sure there will things implanted and improved.
Damage...
Visual damage is a win for Pcars..
Mechanical damage... Mmmmmm i liked a bit more those of Assetto corsa.. It's less forgiving in 100% damage.. A very little touch already affects your aero.
Controller..
Mmmmmm, Best play the 2 games with a wheel, but the controller on assetto is lots better implemented..and easy to go fast on track with it.
The one of project C.A.R.S is way more complicated to find a global setting to enjoy driving with all the different types of cars.
Final thoughts...
For me the 2 games have good and bad things. But they combine well.
I realy recomend have the 2 games..
You want simulate a race with rain.. In the night and feeling a racing weekend.. You put Pcars on.
You want to Drift,enjoy driving, find track limits,improve your skills... And have also great races..All that with the best FFB i ever tried than you put assetto corsa on.
For the rest.... Assetto got les bugs and issues on day one than Pcars... No landmines, crashes, FFB issues..and go on.
The support in Pcars is on his end,and assetto just started on console with great things to come yet..
But.. If i really have to stay with one of the 2 games... I prefer assetto for his driving physics and FFB... They are really amazing.
And on controller it is also better.