I feel like Asseto Corsa has more refined force feed back. You can feel what the car is doing, when it is oversteeing, understanding and an all round better detail than LFS. Same goes for AC physics, however AC has come to the end of its development. Unlike LFS.
But LFS still has many upsides, I think it does a lot of stuff better than other Sims. For example I think it has the best multiplayer layout when choosing a server, one of the most accessible forums and most importantly a friendly community that are just as passionate about racing just as much as you are.(not to mention that the developers interact with the people in the forum's, which makes you know about about them, so you want to support what there doing)
But unlike other Sims you can tell that the LFS developers have put passion and enjoyment into the simulator, not saying that this isn't the case about other Sims, but there's something about LFS that translates that emotion into actual gameplay.
Which is why I actually enjoy playing LFS more than AC, shore LFS is getting a little bit old, but this new update should modernize it keep up with AC and iracing, but despite this still find it the enjoyable to play.(could be because this was the first game I ever bought)
(mind you this is my appinion and you might agree or disagree, it's just and appinion)