There was a period of time when Mercedes went all green. They installed wiring looms that were biodegradable. The insulation on these looms have now rotted and the cars are catching fire. I know this because a mates Merc caught fire. He now has a non-biodegradable loom.
My pick of the Mercs for a daily drive would be a W126.
Whatever you do, get a good one. Mine are proving to be quite costly. They can make any Landrover look cheap and reliable.
Oh, I should add, I have people drive round to my place in various Mercedes models usually around twenty years old.
"You collect Mercedes?" they ask.
"I have two." I reply.
"Do you want to buy mine?" they hopefully enquire.
"No." keeping it short so as not to offend.
"How much would it be worth?" eagerly grasping at straws.
"Not much."

