the above comment and have often found myself wondering which Kunos cars are better or worse in terms of aligning with the data that others have come across.
First, to answer your question, very few physic modders can claim to be able to produce "better" or more to the point more accurate physic than what we have from Kunos in AC.
Not more than 5, I can only think of 3. So beside for the amazing work of a very few, the Kunos physic is the best we can get, and when comparing to other developers work, we are very fortunate to have access to Kunos work in AC.
As per the latest Youtube from Neils, among other interesting comments from that esteemed physic developers, data is very hard to get, accurate and relevant data even harder when at all available,.
All the data? Not possible, which leads to interpretation and "making" the car drive how it should, or at least how the developers think it should.
To me, accurate data is very important for a SIM, without it, there is no SIM, just a game.
But SIM is not a pure science either, more like a craft, pure data as to be complemented by how the car should react when driven. In a perfect engineered world, data would suffice, but in this imperfect SIM world, data is one part of the equation, essential, but just a part.
The search for perfection does not lead to perfection but can get us to a better place, with more accurate car behavior, as long as we still have fun driving them, no harm done.
A lot of my favorite sim cars are in AC and have been developed by Kunos/Aris and that is all that matter to me at the end.