I understood that one is gear driven and the other is momentum driven but the words DA and random orbital are used interchangeably by companies. And the link I posted above has 2 different patterns for DA vs random orbital so I find it confusing.
Just to clarify: the kind you mentioned that stops spinning when you push down, are you referring to the big round polishers like this:
https://www.canac.ca/media/catalog/p...canvas=500:500
Those are cheap and not very aggressive
But this one:
https://store.chemicalguyscanada.ca/...-polisher.html
Says random orbital and dual action! It’s the one I had my eye on for a balance of cheap and quality.