I use Scotch Brite abrasives to put a brushed finish on some of the jewelry I make.
Recently I decided to be a bit more scientific, and bought 4 types, with different degrees of fineness.
A copper sheet was used for the test. Sterling would have been better, but I can't afford to sacrifice that much to science.
7447 Very Fine
7448 Ultra Fine
7445 Super Fine
I use the 7448 Ultra Fine for most work, and the 7447 Very Fine for some basic scratch removal beforehand, should the work need it. I don't see a big difference between the 7447 and the 6444 Medium in terms of scratch pattern. I have used the 7445 Ultra Fine before polishing to good effect once or twice. Anyway, I mostly documented this so I could remember which pad is which, as the Very Fine and Medium pads look a lot alike (one is maroon, the other brown), and there are no intelligible markings on the pads themselves.
You can even use them to clean your pots and pans!
Here is the color of each pad in order from coarse to fine:
6444 Brown Medium
7447 Maroon Very Fine
7448 Light Grey Ultra Fine
7445 White Super Fine