Quiet, smooth riding 4 door sedan advice

Since you mention quiet as a desired feature, whatever you test drive make sure you try rolling the windows down to see how that affects noise.

I didn’t think to do that when buying a new car a couple of years ago and found to my distress after buying an otherwise very nice Chevy Impala that it makes a terrible sound if only a couple of windows are opened. You have to have all four open or closed to avoid the problem.