Whatever you use for swim jigs, It must have no stretch. You want to bury the hook and a swim jig is no wimpy short cast lure. When you have the bait out 20-30+ yards like we all sometimes do, you just aren’t going to be successful with a stretchy line and a single hook, plus weedguard. Add in the fact that you are fishing the swim jigs over a lot of grass, wood and miscelaneous cover and braid just seems to be the best general line. I can see fluoro being the only way to go in clear water w/out heavy cover, but on the mississippi river, I get bit with braid in any cover, or the lack of it. I throw 50 lb braid in the junk and…50 lb braid everywhere else
As far as diving cranks, I like 12 lb sufix siege best. It is extremely durable line that holds up great on rocks and has a high breaking point. I ran a test on line strength and sufix 12 would break on 15-17 lbs of pressure on average! This was even after some moderate abrasion and line twist.
I throw trap baits on pretty much the same lines as I do cranks..12 lb sufix or 14 lb gamma co-polymer is what I am using right now.