I'm bit confused, am I supposed to answer what MB suits me best, or what is my fav Benz of all time or fav Benz currently in production?
Anyways, the best Merc for me is the C Class - spacious enough, fast enough, comfy enough, elegant enough, sporty enough, luxurious enough.
My fav Merc of all time... the W201 first (I kid you not, I could say 'Mercedes' before I could say 'car', Mercedes  = W201 for me back then), then SL Pagoda, SL R107 

, SL R230, and of course, one and only, CLS W219 (I never get tired of just looking at it).
Currently, MB is on a roll, making stunning cars, so its difficult to choose between them. The S and the C lead the way though.