"...the array of arcane knots...the leader...is attached to the fly...and to choose (a knot) is to make a moral choice. You are made to understand that it would not be impossible to fight about it or, at the very least, to quibble darkly." - Tom McGuane
Test Your Knots - The knot is our final connection to the fish, and the most tenuous. You will get all sorts of knot advice; all sorts of claims will be made. The only advice I'll give is that you should test your knots off the water. Sit down some evening and see which knots work best for you.
To test tippet-to-fly knots, you need two handles (I use a wood dowel) with a swivel attached to each one with very heavy mono. Tie a different knot to each swivel from one piece of tippet material. Then pull til one fails. Use smooth continuous pulls and jerky ones. Find out which of your knots is stronger.
For leader-to-tippet knots, use one piece of "heavier" mono and two pieces of "lighter" mono, tie each of the lighter pieces to opposite ends, and test. Try this with various size differences.