Now we live in a not-so-popular area built during a great housing programme in the 60s ("miljonprogrammet" in Swedish) and we love it. Lots of green areas, all parking is in the outer perimeter so we have almost no traffic. The modern areas built in town are nowhere near as well planned from a life quality perspective.
I am not anonymous (nor even pseudonymous) here, so I might as well mention that the area is Vilbergen in the city of Norrköping.
Since all else isn’t equal, you could design cities that are quieter than the most suburbs. But you could also design suburbs that are quieter than most cities.
In the US at least I linked a study that showed cities are far louder on average.
Once you have density high enough you can't live in separate houses. People move to commieblocks or other kinds of multitenant buildings. This shifts everything closer together, makes public transport profitable and having a car becomes optional. These kinds of neighborhoods are quieter than the countryside usually. It looks like this: https://spoldzielnialsm.pl/wp-content/uploads/2018/05/Obecni... https://4.bp.blogspot.com/-ud9-Z0UHVHg/W7-qUjfNT9I/AAAAAAAAi...
Or if you're insane you can mandate enough parking space that this doesn't happen and instead you have highrises in the sea of parking lots.
Using car horns at cities is forbidden anyway, unless there's a crash or a dangerous situation you shouldn't hear them. I can't remember the last time I've heard a car horn in my city.
I've lived in countryside and in several places in 2 different big cities in Poland, and except for one time I lived near a big 4-lane road in the middle of the city (which is a disgrace of communist urban planning BTW) - cities were quieter than the countryside.
Cars are going faster in the countryside and dogs are constantly barking at night at anything that moves.
BTW another factor is windows quality. It significantly changes how quiet your home is.