1/8 is used for deeper presentations but a 1/16 can be used just as deep, it will fall slower and stay in front of the fish longer. they will sometimes only take a smaller bait no matter what size the crappie. If the big one only ate larger baits we would all be useing 1/4 and 3/8. I like the 1/16 for an use anytime anywhere bait. you may hace to fish a little slower but if your tring not to get overwelmed with all the different baits on the market., just pick a few and stick with them.the bait you catch the most on will be the one you use the most