I agree with Kid Sauk. The only advantage I see with braided lines is that they are thinner and allow plugs to dive deeper due to less drag in the water.
Most fish I catch on plugs are in 3-10 feet of water. Any 10-15 pound mono will allow your plugs to cover these depths. I think that the braided lines dive deep too quickly, allowing the plug to be too close to the boat, which allows the fish to see the boat.
Kid Sauk is also right about the abrasion resistance of braided lines. They claim to be better, but I like Maxima way better for abrasion.
Two things that I think make plugging way more successful are the right rod and the right amount of line out.
I bought 2 Ugly Stick 8'6" rods that get laughed at by my friend that guides, but they work perfect for plugging. The tips are very flexible and the rod can handle big fish. I only use them as plug rods as they are not very sensitive as drift rods.
I also bought 2 Shimano 1500LC line counter reels. They allow both rods to be out the exact same distance which is important when plug fishing. I usually go out 20 on the counter which is 60 feet. These reels are probably my favorite piece of equipment I own, except for my Willie drift boat. They are perfect for plugging. I would have had three, but got outbid by smilesforu on e-bay. Good pick up Marty