And now for something altogether more sensible:
Discs - whatever was supplied by Harley on the bikes - they seem to be OK, no roughness or grooves.
Dry or Wet - the sportsters get ridden fairly hard in both conditions, one of them used for daily commute by my son in all weathers, so Wet and Dry.
Low or High Speed - Both Dyna and Sportster get ridden fairly hard. At the Legal Speed limit on most roads most of the time.
Feel - fairly important on the Sportsters, (maybe not so important on the Dyna) you do want to know whats going on if you're pushing on a bit. Would also be nice to use 2 fingers on the Dyna (to brake with

) rather than having to squeeze the life out of the lever.
Fade - Dyna is single disc at front and can fade out a bit if slowing from the Legal Limit

Would be useful if this didn't happen
Service Life - not important - brakes are cheaper than a life - can be replaced more than once.
Price - not relevant - brakes are cheaper than a life - can be replaced more than once.
Environment - Scotland and Scottish weather mainly, although Dyna and Sportster may be going to Europe next summer.
Looking forward to your reply.......