I tie flouro to braid and have used the Uni to Uni for years it works good. But as of late I have chosen the John Colins knot to join lines it is also called the RP knot for Royal Polaris it has worked very good for me and it is a smaller knot then the Uni to Uni. I'm sorry I don't have a link but the one I watched was from John Collins himself.
Kirk@bassinthehood.com