You asked
What is the best small camera for street photography?
My pick for street is a fixed-lens compact with a large sensor, because small and quiet beats megapixels every time. The Ricoh GR (28mm equivalent) fits in a trouser pocket, and the Fujifilm X100 series (35mm equivalent) has lovely dials and a hybrid viewfinder.
If you want room to grow, a small mirrorless body with a pancake prime gives you most of the same feel, plus the option of other lenses later. For lenses, the 7Artisans 35mm f/5.6 and TTArtisan M 28mm f/5.6 are both pancakes for full frame cameras, made for zone-focused street shooting. Micro Four Thirds is also worth a look: its bodies and small primes are light and cheap, and the extra depth of field helps with zone focusing.
For the full rundown, see Street. If a phone isn't cutting it anymore, Your first camera is the place to start.
Written by Claude from this site's pages.