Originally posted by Sandy Hancock I don't think it's too off-topic in a thread about urban gear choices.
And I agree: I have openly carried DSLR's through Rome, Buenos Aires (twice), Venice, London (twice), Paris and several other crowded cities with a fair population of ne'er-do-wells (not to mention Sydney and Melbourne!), and have never felt threatened.
The title of the thread includes the phrase, "small town", so I'm guessing that international camera thieves aren't going to be much of a problem.
In my experience, where the population density in the area you want to shoot in is sparse, a lot of what you want to capture isn't the people necessarily, but people against interesting backgrounds, or at night when there's interesting lighting, or reflections from rain water or such. In such cases, I go for a telephoto - sometimes I use a 100mm macro lens, or a 70-200.
When you do want to take pictures of interesting humans, you need to be closer, so a standard or mild wide angle is a good thing. One thing to consider is that the closer you get to the people you intend to photograph, the more people will act funny and give you questioning looks because the feel they're being stalked and don't know why. (If I get that close, I ask permission.) If you want to get into people's faces, the 35 would be best. I went out to an "outdoor mall" with a KP and the 55mm, and I thought that worked really well. There were people milling about, which increased toward lunch-time, but not crowds, so that was sort of a humans plus ambiance, neither category of subjects predominating.
So the more crowded the scene, the wider the angle needed, the more sparse the population, the longer the reach. I reckon that's what it comes down to for me.