I also have a PD Poly as a "truck gun" which resides in a cheap air-soft holster by Crosman between the driver's seat, and center console of my Dodge Ram. The holster fits it perfectly, and has Velcro lined belt flaps that help secure it to the side of the seat. It gets locked in a secure box bolted in the storage box under the center seat when i'm not in the truck. Loaded with Federal handgun 000buck first two up, and Winchester PDX1 225 GR bonded HP for the next three. It also is easily carried in the woods, and fields, and loaded with 410 rounds of 7 1/2 bird shot is devastating to threatening snakes at 10-15 feet.
It's also a lot of fun just to shoot with the shotgun loads of various shot sizes.
To me the advantages of lighter weight, and smaller, more convenient size makes the PD Poly the best choice for my purposes in a Judge type revolver.