Not so much a stereotype but more general observations…
Before I go any further I’ve been in the Audi scene far longer than BMW so my observations maybe skewed toward the Audi group.
I just find that the Audi group (you guys more so than AZ) are more analytical. You seems to be more concerned with performance improvements and quantifying them through various forms (1/4 mile, 60-130, Vagcom, etc.) vs. aesthetics. Obviously, looks are still very important to the Audi group but in a more subtle way and to a lesser degree…
The BMW guys I’ve spoken to seem to be the reverse. They are more concerned with aesthetics (front lip, rear diffuser, spoilers, etc.) than outright performance. This maybe a result of their age as in general they tend to be a younger group (20-30ish). Further, they aren’t overly concerned about measuring performance independently as they usually accept company dyno figures as fact. Also, I think the lack of a reasonably priced Vagcom(ish) tools (for the BMW) maybe another reason they don’t appear as analytically inclined as the Audi group.
Overall, everyone I’ve met from both sides have been extremely friendly but I feel I gravitate more toward the Audi group mentality vs. the BMW group…