For me there are 2 "just one" or "best" lures to choose from.
#1 choice would be a 3/8 oz spinner bait, white with chrome willow blades. This bait can catch fish in just about any conditions. It can be fished fast, slow, shallow or deep. It will work in most waters most times of the year. Many different fish have been taken with this bait.
#2 choice would be the 6" plastic worm and 3/16 oz weight. It is said that more fish have been caught on the plastic worm than any other lure. The worm will work year round and in any conditions. It is the go to bait for missed strikes. The only problem would be picking the color.
JMO
Allen