Good Question , Looking at the Poll Results here in the W140 1990s to 1998/99 Forum ,obviously it will be higher for the W140s,you should ask the same Question in the W116/W126/W220/W221 Forum too & see what Happen's there .
I to owned a W116/W126 like many of us here and loved it ,for that Time era it was good if not Perfect ,Coming from them and jumping into the W140 is awesome , totally different Experience exept the same Hoodstar in front of you ,lol, so far i have never had any Problems with my S500 ,nothing Major .
I cant Judge the W221 yet as they are still to new to see it's true defects showing ,but i guess they will be Electrical Nightmares later on ,hope not .
The W220 does have a Bad Reputation with its earlier Models not so much with the later once ,maybe not all are Bad but wich once are they wich are Bad .I will skip the W220 all together .
OK ,Best MB ever made ,was the ? W1?
For me its the W140 anyway ,Looks good, Drives exellent ,has everything you need and its a Solid Respected Car ,you just need to find a real good Example of an S500 .
Ciao & good Luck
And dont ask me to Sell u mine cause it,s NOT FOR SALE , capisch , lol.