For frogging I use strictly braid. Anything else I have found has way too much stretch to it. For example, using the cover you were fishing in, if 5+ lb bass would have inhaled your frog, when you stick em with braid you feel the thud of the hook driving home. My experience with anything else, when you set the hook, you feel the stretch of the line. It doesn't mean you can't still land a fish without using braid, but I don't take chances like that when a pig is on the line, with a frog. Frog fishing with a leader... me personally, I would not do. The hooksets on frog is pretty violent, and the chance of that leader snapping on one of those strong hooksets is highly probable. These are just my thoughts on personal experience.