IMO manually lowering the hammer on a 1911 with a round in the chamber makes no sense to me. If you have one in the pipe, cocked and locked is the way to go.
The Sig P series (226, 229, 220 etc) have the best decocking system going.
I agree, they are the best decockers.
Condition 3 or Condition 1. There should be no Condition 2 with 1911’s IMO.