You asked
What is the best camera for street photography?
For street, I put size and quiet ahead of spec sheets. A camera people don't notice, one you can shoot without thinking, beats a bigger file every time. Carry something small all day and you'll actually take pictures.
Sensor size matters less here than you might expect. A good APS-C camera with good lenses is enough for most street work, and you'll carry it more. Full frame earns its place in low light and shallow-depth portraits, not on the pavement.
If you already have a full-frame body, pair it with a pancake. The 7Artisans 35mm f/5.6 and the TTArtisan M 28mm f/5.6 are both thin primes made for zone-focused shooting, which keeps the rig small and quick.
Read the Street guide first, and check Sensor sizes before you spend on a body. Be open about what you're doing, and delete a frame if someone asks.
Written by Claude from this site's pages.