since i tried beam i can not go back to any other rally sim. for me the first thing that matters if physics. and beamng is light years ahead compared to all other sims, every part of the car is actually simulated and responds to physic forces in real time as it should. i still play rbr for the online championships, but i believe beam is the future for any driving sim, and it's getting better with every update!
the AI pacenotes mod is also a really powerful tool, apart from a codriver and a few stages to drive it also has a world editor tool that gives the possibility to create pacenotes on any map and any route and it's quite easy to use.