Whatever the difference is on costs in running the Merc vs Audi, it could be dwarfed by a big repair bill on either and that may happen sometime in the life of a 10 year old car. So I'd probably ignore the mileage difference and go for the Audi as its provenance is known and service history is genuine.
If you look at as you suggest "subject to unforeseen disasters" then the Merc will probably cost a bit less to run and at at 100k versus the Audi approaching 200k be worth a bit more in 5 years time.
Just out of interest I dipped into the Review section of this site and checked out the "What's bad?" tab on each car and now I'm not sure I'd buy either!
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