something is sure : whatever your experience and your favorite simulators (iracing, netkar, race07&co, rfactor, lfs,...) game stock car is an all of fame , specially for v8. Formula Classic , reiza , f3 give a nice bonus
Like Bram wrote a 34 full grids was just amazing.
for now i use:
rfactor for incredible mods database. DRM 1.1 on Nurb with leoffb&realfeel is just a blast to drive.
Netkar pro & virtual ferrari academy for awesome tyre sensation and ffb
Iracing* for laser scanned tracks and if you like "mmo" style.(*but i've unsubscribe and my account has expired since one week)
GTR2 for GT cars & full 24h race
GTL for old car
Race07&co...hum don't use it anymore since three years. for ME he's not anymore at the level of other sims.
Richard burns rally : THE ONE for rally.. what a blast
CARS for weekly update and follow a new project/dev. I like to dl sometime a file , test it and just see what has changed.
lfs: only one where i can use my softth triple screen setup with different size screen AND have independant display. ...but i don't use it
GSC because, from stock , without tweaks, it provide all quality i found on other sims...offline and online. Of course if you like car/tracks he has