My affiliation to the Audi brand started when I was a kid when my father bought one and the heyday of the Audi Sport Quattro rally car. I always tend to chose Audis if available in my sims first over other brands.
I've mostly disliked BMW cars, but after I got my fanatec clubsport with the BMW gt2 rim and saw the BMW Z4 GT3 in real life (yes, a bit cheating for this topic) I started picking them more in sims too. Now 75% of the time I'm driving GT cars I'm in a beamer and DTM for me is only one option
Even better, I'm looking for a car now and I'm probably going for a BMW 320 coupe after liking them more and more in the game