I use POWER PRO braid. It works for me but there are plenty of options out there. On my walleye/SM reel that when I'm casting/jigging I have 15 lb.

On my HEAVY trolling rod when I'm traveling I use 40 lb which is OVERKILL weight wise but still equal to 8 lb mono.

Why the 40? Well I've found that between the weight I carry and my double paddle when I snag up, even when drag is set light, I was losing a lot of lures.
Often even turning to go back especially in rougher water I broke the line.
Now with drag set right, that 40# will either stop me or pull the lure free.
Since going to that set-up I haven't lost ANY lures to snags.
Not for everyone but for me it works.

Westwood is right. The knot and wetting it and pulling slowly to snug means everything. I pull on both ends slowly after wetting.