Re: Old Nissan Qushqai, 200k kms
Wear and tear on engine is function not just of kilometres driven, but also number of starts (more wear is done in first second after cold starting when minimal oil lubricates the engine than in several minutes of warm highway driving) and frequency of maintenance. Also, things like window switches, rubber seals around car, lamps, cloth or leather seats, etc are function of time and weather exposure than kilometres driven.
So, a garaged 4 year old car with 200k Km but with documented regular service record and driven mostly on smooth highway for extended periods would be my strong choice over a 8 year old car with 100k, with no service record, used only on short in-town jaunts by a guy who lives on a rutted road with lots of potholes.
Good luck on your decision!