As mentionnend by Farrous... 70% of luxury cars are leased and we know for fact that those leased cars rarely get the preventive maintenance, care and love as opposed to purchased cars
Most leased cars owners do the bare minimum maintenance and drive them quite had since it not their own car
Having said that it is crucial that you get a full report of the previous owner and as I said it before do NOT rely on your dealership and their cartax/carp roof and have it inspected by an independent bodyshop/Audi specialist since any potential accident and or repair would never show on those "reports" if the previous owner did not declare it to his insurance...
So I say either lease with 0 down payment or take advantage of a depreciation close to 50% after 3 years, but get an extends warranty and get to know your local independent mechanic and enjoy it for years to come!