You’re right – lead core and 3 way rigging crankbaits each have their time and place. Throw in snap weights, jet divers and dipsy divers, it gets to be pretty confusing what you should use to get your crankbaits down there. However, the most important thing to remember is to achieve the desired depth.
Now back to your question – leadcore vs. 3-ways using stick baits. Here are some general rules that I will follow:
I will use leadcore:
1) When fishing calmer conditions (no wind). This will help get my crankbait away from the boat and reduce spooking fish in regard to boat shadows and boat motor noise.
2) When fishing water clarity that is good. It helps to prevents spooking fish versus using a weight in front of the crankbait.
3) When fish are suspended higher in the water column. While trolling, using leadcore will allow you to move up and down the water column a little easier than 3-way rigging.
I typically use 3 way rigging with crankbaits:
1) When the water clarity is poor and if there’s a lot of debris in the water. Reeling in 3 colors of leadcore along with a longer leader to check for debris is time consuming.
2) When I’m fishing a lot of structure and I need to feel/keep contact with the bottom. It’s hard to detect the bottom using leadcore line.
3) When I’m fishing rivers and current is present.
Hope this helps!