Can anyone offer some advice as to the best riding or smoothest ride run flat tires?

I am getting a 2019 E450 Coupe AWD soon, which will replace a 2006 CSL500. If the sizes
work, I may replace my 19" CLS tires with the 19" tires from the E450, then get brand new
tires for the E450. The ride on my CLS is very smooth, with Michelin tires, I can't remember
the model.

I just really want a smooth ride for the E450, which comes with the:
"677 - AVANTGARDE/STANDARD SUSPENSION"