I think that part of the issue is “suburbs” means different things. Suburbs can be pre-war streetcar suburbs or villages, often pretty walkable and dense. It could mean a housing development which can be large with hundreds of houses or town homes or small. My development has 13 houses on two culdesaca and everyone knows everyone, gives a great neighborly vibe. But ive lived in a town home development with 200 houses and most people didnt know anyone. Urban environments and apartments I didnt really know my neighbors.

Small villages, street car suburbs that have individual houses but walkable, and small developments seem best.

The biggest differentiator I have found is: do the majority of people consider this place their long term home or a temporary home? an apartment or town home people know they will only live 2-4 years or so, makes different behavior with a house that everyone plans to spend the next 20 years in.

I think suburbs with porches and stoops help as well, too much garage/car focus means people dont spend time in the front of their house.