Okay, so I'll admit: I don't have one favorite type of shepherd sling. In fact, I prefer different slings at different times. That's the same way with different ways to throw. Sometimes I like to throw underhand, but other times I prefer to throw overhand. It just really depends on what I am throwing.
So, my favorite sling right now is probably the paracord and leather sling that I designed to specifically throw golf balls. It's sad, but I am better at golf with a shepherd sling than I am with clubs :)
Click here to see which sling I'm talking about.