I like the R&D alot especially in a Top Strap like the REMs, R&S, ROA ... I want one for the Starr SAA .44
I also have a Pietta 1861 Colt 5.5" bbl .36 C&B with a .38SPL/38Colt Kirst with Loading gate...love it I'd go Kirst if wanting a loading Gate.
I Do also have for a Reminton Pietta, ASM, or Lyman Uberti, a Kirst with a P and Patend Pending on it ... that's a 5 shot no space for the hammer to set on.
They both are good it's a matter of usage, preferance and cost I guess.