If the car is new, stay away from a machine polisher. A random orbital is safer than rotary no doubt, but unless you really know what you’re doing and are fairly meticulous, you have a better chance of actually creating some swirl marks. Don’t be fooled by silicone/diamondkote/once a year polishes either... they don’t allow the paint to breathe and over he long term actually increase paint degradation (if you plan on having the car for a long time).
Get some quality microfibre cloths, and give it a proper carnuba wax job. If you stay on top of it, you won’t need to do anything aggressive to the paint for a long while. And it’s easier to wash, you should almost never have to take a dirt-filled car wash brush to your finish.
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