I find it difficult to choose just one lure as fish change up here with the season on what they like.

ie..... Take brook trout for an example, first small streamers and then on to nymphs, to dry flies later in the season. But, if I had to choose which one I would go with the old style Mepps Comet with the old rubber minnow on it. Fish has hit them pretty darn good over the years.