From my own testing:
Nothing goes through the guides like a needle nail knot with a small perfection mono loop, Whitlock's super glue connection would also work well
The needle nail knot also recommended by some big names in the sport Gary Borger, Lance Egan , George Anderson for what that is worth. They do have lots of experience on the water
From relative strength standpoint a nail knotted fly line loop is stronger than an albright knot, an albright knot and a castwell knot are about equal strenght and a needle nail knot while fairly strong is the weakest. 30% of the needle nail knots were stronger than a castwell knot. YMMV
Each Knot has it advantages. The Castwell knot is strong the simplest of all the knots. The needle knot goes the rod guides the best, the nail knotted fly line loop is by far the strongest and it is easy to make a very small compact loopand the albright knot is strong and a knot most people are familiar with because they have used it as their fly line backing connection
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