it is hard to explain, but my flouro to mono (tippet to leader) connection is a 5-6 turn surgeon's knot. It never breaks (well maybe a couple of times).
You might think, "a three turn surgeon's looks like crap. I don't want to think about a 5-6 turn!". But I tie them a little differently (as described to me by west coast knot genius Bill Nash): initially I turn one tag around the other 5-6 times like the first half of a blood knot. As I then tie the surgeons knot, the turns make it so that the knot is a neat barrel and very strong. Try it, test it and you will not use a regular surgeon or blood knot at the tippet again.
One cast can change your day...maybe your life.