DRC vs Air practicality and reliability

[ConanBarbarian]

I am facing a dilemma choosing between Air and DRC for an otherwise similar spec 2017 RS6 perf. Both cars have done ~90k-100k km.
I have seen quite a few opinions on suspension preferences, so my intent is to not start another discussion.
I have 2 very specific questions:
1) how much (if any) lower the DRC-equipped car will be compared to Air in DYNAMIC mode? There is an article for C8 RS7 talking about 4 mm difference, but nothing for C7 RS7/RS6.
2) given the high mileage, which suspension setup is likely to give me more problems, i.e., potential cost of repairs?

[wildbore]

I have yet to see a thread on here by someone having problems with the air suspension system. However, threads on DRC issues...!

[RiggsRS]

Here in The Netherlands it is almost impossible to find an Air car.... seems like 95% of C7 RS6's have DRC equipped.......