fluorocarbon. 10 to 12lb test . I like seaguar invisx. Watts Bar is very clear especially in the wintertime. Crystal Shad and TN shad would be my choices.
I am using 12lb shooter. Funny this came up... I went out in the Kayak yesterday and this was the only bait I could get bit on. Had to fish it crazy slow. I started counting seconds between twitchs... magic number was 6. 6 seconds of just letting it sit there and then you would see the line jump..
Caught about 20 like that in a 50 acre private lake I was on... lot of fun.