RB = Dangerous if falls on the wrong hand or even wrong techic...
Need skill and experienced first.
DA = Safe to use...
I feel that the fastest way to learn is to make mistake, when using RB, best is get a scrap panel and test. Do some dry buffing, early polish removal, tilt slightly and try burning through the paintwork then try finish down defect free under various lighting. This will help to uds and judge better what the RB can achieve and damage. It is not as difficult as many claim but requires a little practise. It is just like driving, it is difficult at the start but soon you will get use to it after driving for few times. However, even if you are experience, if ya not focus, you can still go into a accident..
+ soon or later you might find not 'enough' cutting power on your tool...
To be safe, start with ROB....play around with it..until you find yourself really need heavy duty like compounding...than get RB
DA is in between....so you will stuck in between either
Have to see ganna poison how deep, if venomous posion, better get rotary.. LOL