I find it funny that detailing suppliers and MFGs have to bad mouth (and lie) their competition in order to try and get customers. The people bad mouthing wouldn't have to unless they were desperate or jealous. Also the ones hosting "Evil Twin" sites ... again desperation.... it's getting pretty ridiculous these days...
As you've leared already, the Optimum line of polishes were designed for rotary use (as is Menzerna) and they work best with said machine. If you do decide to use Optimum with a DA, use very very very little, and OC will yield results faster than OP. Speed 6 is also the key.
The most friendly polishes via
PC or UDM are the Pinnacle XMT and Poorboy SSR line. All polishes require different techniques but the learning curve for these polishes aren't bad at all...