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UDM is definitely more aggressive than the PC, maybe a touch under a Cyclo. However, the biggest advantage for me is how well it finishes out even with a cutting pad and compound on most paints. It spins a lot faster under pressure than the PC does so it breaks down polishes better. I think it does better finishing work than the PC as well.
Not sure in your case it is worth it if you can finish down well with a rotary. However, if you want a machine that on paint in moderate to decent condition that will correct faster and finish down better than the PC, then the UDM is worth it. Plus, then you can use a Cyclo carpet brush attachment on your PC and relegate it to carpet duty.