S 80 II Used cars Experience/recommendation

Hello, I have a question about the current S80 model. Is the S80 generally more reliable and less prone to interference in terms of electronics and mechanics than an S-Class, 7 Series Bmw or an Audi A8? After a current S80 with all-wheel drive as petrol with xenon and leather etc., I looked around on AS24 and came on very few models. There were 15. The cheapest costs about 20 or 21,000 € with V8 315 hp and mileage approx. 130,000, BJ 2007 and on AS24 also BJ 2007 approx. 30.00 0 € V8 315 hp and from 30-66,000 km Can you buy an S80 with the high mileage or are the 10 or 9,000 € investment better for the lower run S80? Will the S80 become very vulnerable from this mileage or can you say that the S80 clearly, in terms of reliability, electronic problems maintenance costs (not the consumption, but the inspection costs, repair prices and insurances) better /favorable than the above-mentioned representatives of the upper class with d are comparable running performance and are also generally expressed? Greetings bt