We like to pull two 100# test monofilament lines on cuban hand reels. They are hooked to downriggers, one about 50' and one about 75' behind the boat. After the downrigger comes about 10-15' of stainless leader, then a metal, one-hook spoon. It's a fun rig to set up and mess about with when you feel like fishing
. When the downrigger pops to the surface, you know you've caught a fish (or some Sargasso weed). Getting the fish in with the hand reel is fun.
The trouble we've had in the past with sportfishing rigs on a sailboat is that you can't stop the boat to fight the fish. On a sportfisherman, you stop as soon as the fish strikes, and then you back down on it as you're fighting. If a big fish hits a line on a rod and reel on a sailboat, they can strip all the line off before you can get around to reacting.
Of course, if they're that big, I'm not quite sure what the heck you'd do with them if you got them up to the sailboat, anyway.