Braid to fluoro. Fluoro has some stretch, not as much as mono but enough to give you some leeway from violent headshakes at the end game. A bit more abrasion resistance, pound for pound, but less visibility to the fish so you can go up in line strength and still get bit. But go shorter than several yards at your peril. There is not enough stretch in a yard of fluoro, and I've lost several nice fish just outside of the gaff when a violent surge against my final-fight drag tore the hook out. Now I usually do a cast-length of fluoro.
Certainly no expert but I do all right FF rigs are braid to a short fluoro leader 130/ 200/ 300 depending on jig size. Flyline/ sinker rigs are braid to 25-30 feet of fluorocarbon, wind on style. I use a short section of HC braid to attach the fluoro to the solid braid.