Duo works great on wool & nylon, and polyprop if it's not matted down. Useless on matted polyprop traffic lanes. It is fantastic for domestic work where you need a nimble machine, particularly great on stairs used side to side and over the nosings.....but very slow on big open spaces.
The orbiter probably not such great agitation for domestic work and you'll be there all day on commercials, or any big areas like a through lounge of an empty house. Man size rotary needed for that, or a big 400mm wide CRB machine.