A lot of anglers who head to Canada for spring and fall walleye hunts want to use Fireline for their crawler or minnow rigs. It makes sense, since at any time a northern could rip a small diameter mono leader to shreds. It also makes sense because of the stained waters found in many of the lakes up there. It makes little sense for those fishing the clear waters of Michigan and the Great Lakes.
You actually have several choices for your rigs and harnesses, hands down my fav is to lean to the big side. Go as big as you can get away with is my rule, so I use 20 lb Big Game Trilene, by Berkley. Some folks might use 15 lb Big Game, and it would be a good choice. Some anglers prefer Trilene XT for their rigging. Others will use 14, 17 and 20 lb in fluorocarbon lines, and you would be completely right in your choices.
I use Big Game because its cheaper than XT, and just as good. Have tried FC lines before, and despite what they say about abrasion resistance, one nick and it seems like its toast. And with the zebra muscles to deal with, no thanks.