I tried #2 with the PC but it gummed up a bit. On the PC I'm happier using #83.
But I really like #2 with the rotary. It bites and works fast and well. I find if I lift pressure on the pad just before the #2 dissipates, it buffs to a great shine.
I like #2 because it does pull the swirls and scratches out but it is thin and splatters a lot for me. (I know my technique is not the best).