I am rewiring a duplex that burned due to negligence of a tenant. In doing so I was considering running MC Armored cable to all drops rather than Romex. I know the question of why arises because MC is more expensive than Romex. Well in short I want to have a conduit of the wire to prevent any future potential fires and I don't have to drill the rafters for each run as the MC can be secured to the top of the rafter as the attic is not accessible by any means that is practical. In the end though I need to be sure I am not violating and standards or codes.