What’s your budget? Lexus is renouned for its quietude.
Seriously, your best bet is to test drive all those that look interesting to you. To get an idea how complex the question of sound is, take a gander at this definition of “sones”. Sones measurements are thought to be more accurate than decible level measurements.
If you have the courage and willingness to do a bit of labor, you can also significantly reduce the sound level in many modestly priced cars. I gutted everything from the B pillars back in my car and lined it with structural vibration damping material overlaid in many areas with sound insulating matting and both road noise and the sound that penetrates from the outside dropped dramatically. And I had fun doing it.