Some here believe that a rotary gives a finer finish that any other type of polisher, at least *IF* (mighty big "if", IMO) you use it properly.
I myself have never experienced that.
Otherwise, there are *VERY* few things you *need* a rotary for, and in the time it takes to learn (let alone master) the rotary most people could do a lifetime's worth of corrections with another, easier/safer, type of polisher.
Short answer: if you need to ask, just buy a
Flex 3401. I wouldn't give a moment's concern to the greater possibility of causing damage, but that's just me and IMO is a matter of knowledge base and mindset.
IME a PC is only marginally sufficient for this stuff, though the newer XP model, or better yet the newest Griot's random orbital, will probably work a bit better.
There's always the Cyclo, but much as I love it I'd recommend the
Flex instead.