I almost always have both tied on. They can be interchangeable at times, and almost complete opposites at others. They are both very versatile, and can be fished in several ways. You mostly tailor a chatter with the trailer, and a spinnerbait with the blade(s), and that is usually the key. I usually have a plan that works, but sometimes the fish have different ideas. I really like fishing spinnerbaits, and dislike fishing chatters, but the dumb things get the job done better than anything else sometimes.