I have no business telling anyone how to fish saltwater on this forum, considering the expertise here, but I'll say what little I'm sure of. Braid, and only braid, should be used for shorecasting because you'll get significantly more distance. Braid also gives crispier hookups when bottom fishing.
Aside from that, I hear a lot of arguing about braid vs. mono. I troll with braid but learned the hard way to tie on 8-10 feet of mono leader to absorb the shock of a big fish hitting while the boat's moving. I think a lot of people do that.
One guy I know believes braid cuts too easily on rocks. I don't have an opinion about that, but if true it could be a big deal because groupers like to head for the rocks when hooked.
If you get a birds nest in your reel, you'll wish you were fishing mono. It's great having the additional yards braid gives you, but you will probably need that extra line if you have to cut out a birds nest.