IMHO, the bottom line in comparing tippet material is its measured diameter and how well it holds the knots I tie. In the past, I have measured diameters with a micrometer and found those having the greatest listed breaking strength were oftentimes larger in diameter. Both Puglisi and Maxima material were consistently oversize if my memory serves me right. Everybody ties knots differently, and uses different knots, and when we are astream we are not tying knots under laboratory conditions. Take some time during non-fishing times to experiment with different knots and how strong they are in the material you use. For fly knots, the best way to do this is to tie a hook on each end of a 16" strand of leader material using different knots and jerk-pull this while securely holding the hooks. Two nails and a pair of work gloves help with the holding process.