For those of you who want to maintain the strength of braid but are worried that it may be too visible to fish, adding a leader may be the answer you’re looking for. Here’s a video of a Double Uni Knot which you can use to attach your leader to your braid.
You’re going to want to start out with about 5 or 6 feet of either mono or fluorocarbon. More is better in this situation as you’re probably going to end up losing quite a bit of your leader from switching lures anyway. It’s better to start off with too much than too little, as you can always cut off the excess later.
Just to be clear I personally don’t think anyone should use a leader while using topwater lures. One exception to this rule would be if you’re really having a hard time setting the hook with topwater frogs. The mono or fluorocarbon leader will give you that stretch you need to not rip the lure out of the frogs mouth. Using leaders is for more of a finesse type of fishing in which the fish will actually have a chance to see a line. Any fishing near vegetation will probably be good without a leader. Another knot just means another point of potential failure of the line.