I know some people really like bluegills but in my experience shad outperforms every time hands down. Chicken breast has worked better for me than gills too. Ill probably keep trying them some but with as much shad is in the lake and can be caught from almost any ramp...ill stick with shad
Shad are better most of the time, if you can get them and keep them alive. But my experience is that blue gill live longer than shad in most bait buckets, and there are times when live bluegill outperform dead/cut shad. Depending on the bank fishing spot, it's also usually easier to fish a second pole and add new bluegill to the bait bucket.
I try to think about how to help that bluegill avoid the turtle for longer. Keeping it off the bottom helps a lot, as does a lighter sinker, as does a longer leader between the sinker and hook, as does a lighter hook to improve its swimming mobility.