depends on what factors you look for?
realism->
iracing->or so i heard, but playing it will end up being really expensive so no go for me atleast
moddability->fun->good amount of realism->
rfactor, aint too expensive neither, but rfactor 2 is arriving sometimes "soon" so dont know?
some say that that
lfs is good too, but havent tried it myself
then there is these
gtr and
simbin games which are fun realisticish to drive
sorry if this message seems bit random, but there aint really no "gran turismo like" games out there in the pc????
but those go as an "realistic" racing games are concerned
if want rally, i suggest trying out richard burns rally, it is pretty much excellent in my opinion
for bit "lighter" for fun experience, maybe some nfs or test drive unlimited?
doesnt the new ones have some sort of career?