Abrasives anything for removing or minimizing imperfections (micro-scratches, medium scratches, hard water spots, swirls) I use a rotary buffer, my personal choice is a Makita. I tend to work with Meguiars pads mostly foam. Part number W-7006
My compound of choice at this time is 3M Perfect-IT III, either light cut or heavy cut depending on the issues presented.
Polish/Glazes, I choose to use a orbital like the Porter Cable 7424 with a polishing pad from Meguiars. Part number W-8006. The polish I always go back to use is Meguiars Showcar Glaze part number M-0716 which is the 64oz. size. This lasts me about a month if I get three full details a week. It also comes in a 16oz. bottle as well. Before using a glaze I always follow up my cutting with 3M SMR dark/light depending on the color paint I'm working with. This stuff really does a nice job, and does it fairly quick.
Wax products or Klasse Acrylic I use the Porter Cable 7424 with the finishing pad from Meguiars. Part number W-9006. The only wax I use a machine to apply is Meguiars #26 HI-TECH Yellow. For Blitz wax I use a foam applicator and nothing else.
For polish/glaze/some wax using an orbital just cuts down the time to get the main large areas. You can do as I do and follow up with a foam or terry cloth pad to finish off those hard to reach places.