I have to say Nickajack Lake has a slight edge on Chickamauga Lake. Fishing off the piers just below the dams I have better results from the fish at Nickajack Lake. More big Bluegill and bigger fish. So I have to give the edge to Nickajack Lake.
Nickajack has less traffic and some good structure that bluegill love. BG's are off bed now and willowflys are coming out. I am fishing 1 hour after sunup and 2 hours before sun down. It is hard to keep those tiny bass from hitting before the bluegills.