Personally, it's not just about break strength. Flourocarbon is more abrasion resistant and more sensitive than mono. I use it mainly for those reasons. MY PB Bass was a double digit fish that was in a down tree in the water. Hooked up on a Slammer with 65# Power pro and a 20# flouro leader. The fish ended up getting wrapped in the tree branches. I truly believe had I hooked this fish with a mono leader I would have been buying a new Slammer. The flourocarbon leader wasn't even nicked. Just that alone sold me. my .02
Mitch