My break-offs were with the commercially tied flies that had used fluoro (not going to mention brands but two of them)....I've never had one of the 40 lb Big Game mono ties break that I did myself. I am a firm believer in using whatever works for you regardless of the current popular trend...I use fluoro for some things and mono for others depending on what I find actually works best for my application of the material or tactic etc. Sometimes it pays to swim against the current
Sk8man's post in Help with snelling hooks with fluorocarbon was marked as the answer