Which one is more comfortable, depends upon the shooter. The Bisley trigger is known to be a "pincher" in a Bisley grip frame. It will pinch the fatty part of the trigger finger, between the second and third joint, between the back of the trigger and the grip frame. The Bisley trigger is too long to work in a NMBH XR3-RED grip frame. You would have to grind off a portion of the trigger at the bottom in order for it to not hit the grip frame. Also, the Bisley trigger has more metal at the top and would require that you enlarge the opening in the grip frame at the top of the trigger or grind off the extra metal from the Bisley trigger.