Gosh this happens all the time and I don't know if this is the case for this thread but the title says,
PC7424 vs Meguiar's G220
There's a huge difference between a PC 7424 and a PC 7424XP
It seems it's too easy for people to not type the last 2 letters XP to clearly define which tool they're referring to?
The XP model is dramatically better at keeping a pad rotating under pressure as compared to a first generation Porter Cable 7424 and 7336
Also, is the G220 you're referring to an actual G220 or is it the new G220v2 model as there's a difference there.
Point is, if you're purchasing a DA Polisher to remove swirls you want a 2nd generation DA Polisher because it will save you time for the simple reason that the newer 2nd generation DA Polishers rotate pads better under pressure it's when the pad is rotating that it is removing swirls.
See this article, while it doesn't reference the G220 it does reference the G110v2,
How to choose the right polisher for your detailing project Single Head - Random Orbital Polishers - Free Rotating Spindle Assemblies
Porter Cable 7424XP
4.5 AMP
500 Watt Motor
5 pounds
3 Year Limited Warranty - 1 Year Free Service - 90 Days Money Back
Griot's Garage Random Orbital Polisher
7.0 AMP
850 Watt Motor
5.5 pounds
Griot's Lifetime Warranty
Griot's Garage 3" Mini Polisher
2.0 AMP
240 Watt Motor
Griot's Lifetime Warranty
Meguiar's G110v2
4.2 AMP
430 Watt Motor
5 pounds
1 Year Limited Warranty