I know what you mean. Everyone seems to have one of those flies that works for everyone else, but not for them. For me, it's the Prince. I'm sure it's a confidence thing. There are some in my fly box, but I don't tie them on as often as I should and when I do try them, it's usually tough conditions and / or I don't give them a good chance. Or maybe it's that I don't tie those biot tails and wings very well!