When you have stoops, people sit on them.
This means more conversation outside in public, creating community.
When I was young, it was normal for a group of kids to sit on any stoop if the front gate was open. (This has mostly gone away)
Older people might spend hours sitting on their stoop, and basically end up being a neighborhood watch.
Neighbors get to know each other, and are more likely to quickly identify someone being violent and call the police.
Overall, I would always choose a block with stoops over one without, everything else being more or less equal.