On the rotary, Meguiars pads arealways the pads that I reach for - they are simply supberb on rotary polishers.
On the PC they also work very effectively, and I have had no issues using the W7006 burgandy cutting pad on the PC, espeically if followed by a finishing polish on there polishing pad as mentioned above...
One thing is that the megs pads require a 5" backing plate. A 6" backing plate is too wide for the velcro backing, and can cut into the back of the foam, espiecially on the softer W8006 and W9006 pads and destroy the pad.