My ‘14Touareg came with 20s; love the looks, hate the ride, not that happy about the weight, very hard to get wheels bolted on and not get SWS (follow TSB to the letter, etc), and almost never let wife drive it since she is semi unaware of potholes (of which this area of Maine is loaded, paying taxes for what exactly?)
I got a set of decent 18s from a Q7 for winters, ride is much better due to increase in side wall height, and tire/wheel combo is a few pounds lighter, 0 SWS.
This past summer I picked up a set of 18 Cayenne 5 spokes. Less expensive tires, overall less unsprung weight, and like the aesthetics. 20s still look nicer but on balance I’m happy with the trade offs.
I spent a lot of time looking for light, strong, and reasonably priced wheels; pick 2, your not getting all 3.
Best aftermarket 5x130, hub centric, strong, and reasonably light wheels I found with a look that I liked are made by Braid. Not inexpensive (less than BBS but not much). Didn’t see anything on Tire Rack that I cared for looks wise or that met my personal requirements of hub centric without rings and probable strength/durability.
The weight of Touareg combined with their propensity for SWS, I cant see using anything but an OEM Touareg, Q7, or Cayenne wheel.