The materials I use are:

Square D QO---I occasionally cut live wires & the QO always trips, the cheaper ones don't. The Visi-trip indicator lets my customers know which breaker trips & if it has reset properly.

Pass & Seymore devices with nylon covers---I used Leviton for years & tried the P&S---I felt like I had a commercial grade Leviton in my hands. Also, for what I'm guessing is a better design, the devices & covers fit together right...I was having to adjust the Leviton. As for the covers, nylon is unbreakable & non-conductive.

Steel City boxes---Usually deep & sometimes double-deep. They have a new type called "wrap-mount" for steel studs. I was having to modify bracket boxes for the heavy guage steel studs.

On quality I take my time & do it right. If I'm using stranded wire I use clamping type devices, or pigtail solid wire onto them (God bless you if you can get a sranded wire under the screw as well as a solid wire...I can't). I tape the devices after connections. I also tape wire nuts...an old habit from machine wiring. I calculate for voltage-drop. I wire receptacles at 20 amp where 15 is allowed here in residences.

Although most of my work is commercial now, I built the business on "residential after the builder". In residences I throw a drop cloth at the door to wipe my feet & more under my work area. I'm polite with my customers & don't swear or play music. If I make holes in the walls or ceiling, I patch them. Some other items are clear communication, clear & simple conracts, and neat appearance.

Dave