Random orbital is best (to avoid paint damage anyway)
About it being a cordless, I dunno. I've never used a cordless, so aslong as it has enough power, and can hold a charge it should be good.
And yes, Dana, lighter coloured cars are better at hiding imperfections, like swirl marks, light scratches, etc.
Oh, and Dana, most polishers make a mess. My boss uses a highspeed rotory polisher, and when he's done he is usually covered with polish.
