I use the flurocarbon leader because it wears better. I broke off 2 nice Stripers with braid tied directly to spoon.
Also fluro is stiffer and your lures don't tend to wrap or foul like they do on the braid tied direct to lute. This is especially true on small lures nd jigs.
I tie the braid directly to the fluro using back to back uniknots. I've yet to have one break and it's super easy to tie.