You can use SwirlX with either a polishing pad or finishing pad, the way I was suggestion was with a polishing pad.
Use the UC with the light orange cutting pad
SwirlX with polishing pad
Wax or paint sealant with the finishing pad
You say your swirls are "Moderate", and that's kind of subjective but if you like, you could get
1 light cutting pad
4 polishing pads
1 finishing pad
Use the light cutting pad for any areas that are really bad
Use the polishing pads for most of the vehicle with the UC, save one or two for the SwirlX and save the finishing pad for your wax or paint sealant.
The bigger point is this, you need a few different types of pads so you have something to test with when first starting out. You want to use the least aggressive approach when working on your car or even a customer's car as the idea behind this is to remove the defects while leaving the most paint on the car.
You can't figure out which pad/product combo will work best till do some testing and you can't do any testing without some pads to test with.
