Dynon is a robust braid but the downside is that it soaks up water like a big old sponge which takes the edge off bite detection and tide-cutting performance. Fireline is probably the strongest fused line out there, but it is very thick in comparison to most modern braided/fused lines, and tests show the actual braking strains to be nearer twice that advertised on the spools. Try a simple spring-balance pull-test for yourself…you will be surprised at the results.
Having used most of the braids available, I would suggest that Power Pro and the new Daiwa Accudepth are currently the best available.