So if I had to pick one... A1 Bold. Works great as a marinade, you can brush it, you can dip it, it has flavor but does not over power, it goes good in meat loaf. Plus you can cut it with ketchup and it makes a mean meat loaf sauce. I don't know how it pairs with FiSH though. Oh and you can pour it on corn bread for moist spicy corn bread.
Up here in Ohio sauces are hard to come by since I shop in mostly low income areas I am lucky to have national brand ketchup. So fancy meat sauces are hard to come by.
Current Smoker: Char-Griller Kamado