I am old and don't see well so I tie a bunch of snaps on my line before heading out and then change lures throughout the day as needed by just unsnapping and changing lures and snapping back up. It works great ! The gap in the snap also lets the spoon work with a little more action than being tied on with a knot.I use sizes #1, #2, #3 and#4. #3 for spoons and #1 and #2 for bass baits. #3 for trolling. Tie a good knot when attaching the snap and it should last all day. Check the line after catching a lot of fish. If there are nicks in the line, retie or pick up another rod. Retie the snaps before the next fishing trip.These are #1, #2, #4, #6, #8
A swivel is built to allow a spinner to work properly. That circular motion is not needed on a lure that runs from side to side. If you have spinner lures then you need swivels.Any particular reason to use the snap instead of swivel type snap? It does look like it might be easier to unsnap. I think I'm ordering some also.
I have a Plano box full of other Plano boxes LOLI have a plano box full of snap swivels and snaps....but seem to only use the snaps anymore.
Sizes are #1 #2 #4 and #6 for the same applications Wayne noted above.