There's something with the physics that makes me feel more connected to the road. It may be because LFS is the game I played the most when I got my G27, so it has always been the "gold standard" for me. Or it may be because the LFS physics are just best overall. But when I play LFS, I can feel the road much better than I can on any other racing game. Even though I haven't played LFS for many years now, as soon as I fired it up I felt the LFS physics in my hands as it was yesterday.
This is probably because LFS is quite a few years old, but it's less resource demanding than a lot of other games. I don't have my PC fans spinning up like crazy when I load in the game, and it's nice for once to hear the engine sound over the PC fans. I can run this game on my Macbook Air from 2014.
I like that the engine noise is generated in real-time based on throttle and engine load, exhaust system etc.
Play any other game where the noises sounds are recorded, for example NFS Shift, and hear the engine noises overlapping as the RPM increases, which sounds horrible. Another example is The Long Drive. Listen to the engine when it's idling, and you'll quickly get annoyed by the same 1 second recording looping again and again.
LFS doesn't have this annoyance when every cylinder firing sounds slightly unique.
This is not unique to LFS, I know other games has that too. But it's definitely worth mentioning. Using dedicated servers, rather than this P2P crap that a lot of other games are using. A server system is more cheat resistant, so we don't have the problem where anyone who joins the server can just explode everyone or put everyone in cages. Everyone who have played GTA Online on PC will understand.
And being able to create your own car skin, and have everyone else see it on your car, that's something I haven't seen in other games!