I've used Airpower, Luer Locks and Snap Locks (like the SMC's only from mcmaster.com) and they all work fine. It's only a matter of cost, size and convenience. Snap Locks are the easiest but the biggest. Airpower are the smallest but sometines are a pain if space is cramped. I also use larger Snap Locks for fuel connections on my jug and connections to the airplane fuel system. The ones with the check valve are great for the fueling line on the UAT.