I've never used any of Don's leather, (for obvious reasons), but he has made grips for me. Quite happy with his workmanship.
As for rigs for beginners: The "Lawman" pictured isn't a historical styled gun rig. This wasn't found in the "Old West". If you are interested in historical accuracy, you wouldn't choose this rig. It would work fine for shooting, but wouldn't fit in with shooting groups that require historical authenticity.
The "Bounty Hunter" has traditional "Old West" lines and would be acceptable to shooting groups that have authenticity as one of their requirements. The holsters are more secure and don't require the "Hollywood" hammer thong to keep 'em in the holster while active.
As for the rig that would give you the most advantage as a new shooter: the "Lawman" might afford some advantage in speed, but the "Bounty Hunter" would give you more security for your weapon in those stages where you are required to move between shooting events. The real advantage comes with practicing with the gear you have. If you drill with the equipment you have, you will become as competent as you can be. Familiarity and repetition are the keys to successful shooting.
Will