if you were to ask about which city put out the best producers in the bay, it would be fairfield 100%... mike mosley, rick rock, rhythmx, BC, and dj pimp... 4 of the all time best, and me...
as far as rapper though, its gotta be vallejo, mac dre, psd, e-40, celly cel, b-legit, mac mall, i could go on and on