On some extremely hard surfaces, it is possible to get a near LSP-ready finish with
M105 and the solo Burgandy heavy cutting wool pad. I have achieved exactly that on my BMW 335i coupe Sapphire Metallic paint. The clear coat was so hard that
M105 did not leave any swirls or nicks that dread detailers working on softer paint. Of course, paint with that kind of hardness is rare even from BMW.
Personally, I like the Purple Foamed Wool. I cannot explain why, but on some paints I think I get a much smoother fiinish with it than from the LC orange cutting pad when using
M105. Also, the PFW doesn't require a lot of pressure to get the pad going. With the orange pad, a lot of pressure and products are needed. The PFW is a very good pad. Some people like it, some hate it. You have to try it to decide. I am not a professional detailer and I wash my car diligently, so a PFW is aggressive enough for me in most cases. I have the W5000 and solo pads at my disposal in case I need some serious corrections.
PO85u has slightly more cut than PO85RD. PO85RD, with finer abrasives, is able to finish much smoother than
PO85u. Honestly, to even the enthusiasts, it is very hard to tell the difference between
PO85u and PO85RD. We are comparing very similar ultra-fine finishing polishes here.