These are both large bucktail-style musky lures built for topwater-adjacent, shallow-water night fishing with a strong thumping vibration and flash. For fall, when pike and musky often roam weeds, rock edges, and shallow flats, the slow-sink profile helps keep the bait in the strike zone without hanging up.
Switch to a different lure type if fish are refusing the thump, if the water is very cold and they want a slower fall, or if you need a more subtle profile in ultra-clear water. A smaller bucktail, glide bait, or soft plastic may outproduce these when fish are pressured or short-striking.