The green, and blue Buff and Shine pads work great on the PC. I used them specifically with non diminishing abrasive liquids - Meguiar's Ultimate Compound, or M100.
If the paint is really hard, I use the orange Buff and Shine microfiber pads. I feel the out cut the uro-fiber by miles. I've use the PC to cut for years. Works especially great with the Meguiar's microfiber correction system. That system only requires 4800 maximum opm, the extra speed offered by the gg6 doesn't do much for that. I also don't the gg6 to vibrate more, but it is a very capable tool.
Actually, if I was to recommend anything, it would be the PC, Meguiar's D/A microfiber correction system. I'd also suggest a separate polishing + sealing system, and dedicated sealant - M205 and megs yellow foam discs, M21 and megs black foam discs. Maybe get some megs burgundy foam cutting pads just in case... D300 works great with the cutting foam too. That is what I'd go with if starting over with the PC.