Shotgun belt is cheaper and easier, but the PBMafia wrist harnesses I ordered without the wristband part are GREAT. A little more secure and a little thicker, less chance of tube breakage in the event of a hit. Also probably last longer, as the shotgun belt loops sometimes catch a burr on the tubes and start to unwind a little bit. They also lose their elasticity over time, but the non-elastic wrist harnesses don't have that problem. But you need more room for the wrist panels; there are more places where you can put the shotgun belt sections on a given pair of pants, and greater fine-tuning ability is nice. So, pros and cons on both sides. The best way might be wrist panels on the thighs, belt sections on the hips and/or sides.
ZDF42 #61 "Darwin"