what is the best racing sim for pc ? one like gt5 or forza motorsport with a good online gameplay where i can drag, drift and race. ill use a driving wheel
I don't know of any PC racing sim like GT or Forza, the nearest thing to it I know of will be Assetto Corsa, it shouldn't be too long before it's released. P CARS won't be out until next year as far as I know. The drifting in rfactor is not very realistic and you need to mod the physics to make it happen, but if you're happy drifting in GT5 you might be able to enjoy it.
The most realistic sim on PC is Live for Speed. It's perfect for drifting (has drag racing too), and the demo is free. Apart from that, there are good suggestions in here already.
I agree with Wolfe, if you want the most realistic, especially when it comes to drifting (most sims fail at drifting), nothing available now comes close.
But I played Assetto Corsa tech preview recently and it feels as good to drive as LFS, the FFB feels very similar.