For residential Plastic boxes carlon or thomas and Betts whatever is available, both have a good selection and variety of box types. All wiring romex, 14/2 and 14/3 on gen purpose and 12/2 and greater when needed. Competition is very tight in the residential market here, that this is the trade practice. Except in NYC where romexis illegal, bx is still used, but most contractors are starting to use MC.
Commercial is a different ball of wax. MC and metal when called for. Emt when called for. NYC fire alarms call for threaded aluminum and metal boxes, also special BSA wire in some instances. NYC housing or projects call for threaded rigid in public halls, tank rooms, emt can be used in motor rooms and other such spaces. Outside they spec for pvc coated with 10awg thhn for 15 amp lighting circuits.
