I have customers who have used 3M red exclusively for 5+ years on all their commercial jobs.
White pads are no good for encap....might be ok if you're going to extract after and just use the roto for a light scrub.
Having only used VCT pads on tile and not carpet, how long will they last? How will you know when you've gotten the useful life out of one? Obviously you have both sides, but when is one side no longer effective?