When I did residential, I was a big fan of the Carlon 21 cuin pvc box. Some GCs who did only upscale custom homes specified metal boxes only. Cost on these homes wasn't a factor so I liked to use the Raco 3-1/2" deep metal box with the stud bracket on the side. I can't remember the number but they were gangable. In commercial, I preferred the raco 232 4x4x2-1/8 with the stud bracket and use mud rings. EMT when ever possible. If I build myself another house it will all be in EMT.
