I have some ludicrously expensive air driven ones at work that have built in waterfeed etc. TBH I find my one at home which is a £40 silverline electric one from toolstation easier to use. Massed of power if you need it but also really slow and gentle if needed. Heavier than the air driven one but much more controllable.
Just be careful with rotary polishers - as said above it can go horribly wrong in seconds
As aldo said above go Random Orbit if you are not sure - if you go rotary go slow to start with and to begin with keep the panel wet and cool. Eventually you will begin to feel if you are working it to much in one place. They begin to sort of "bite" on the paint.