Go with whatever camera(s) you are most comfortable with.
I have thousands of "street" images in my files, most of which are tack sharp and very enlargable (I cull my files every few years and fuzzy generally goes to the trash), all shot on 35mm. An amazing amount of those on Kodachrome.
I use Nikons exclusively, not because they are any better than any other brand but because I've been shooting them on a daily basis since the 1980s and I can literally run them blindfolded in the dark.
BTW, an F4 or F5 with a 20, 24, or 28mm AF lens and the prism housing removed - allowing waist level operation - is a very discreet tool for crowded street situations.