I used to recommend Pirellis but that firm decided to discontinue the darned excellent 14 inch tires they made

I still use Pirelli P6000 (205-65-15 Vrated) tires on the 15 inch W126 wheels on my 300TDs.
Pirelli made really good tires, and although slightly softer than others I have used, they really stick wet or dry.
Handling is my main concern. I do NOT recommend Michelin due to their excessive pricing policy (they seem to jack it up every few months) and their MXV-tires are also quite noisy when driving over pavement cracks, due to a hard compound they use for long life.

Someone on this forum reported good results with Yokohama Avid or Parada tires (not sure what the differences are) - thats just what I wrote down. YMMV
Dieseldiehard
1971 220 (gas) 4-spd manual 104041
1979 300TD w/ ’85 turbo engine 289560
1983 300D 237490
1985 300TD 206150
1975 300D (looking for an engine)