Big Creek has bigger fish and fewer bugs but also has rattlesnakes and warmer temps.
FIsh Lake has LOTS of bugs this time of year and smaller fish. The lake is tougher to fish without a small raft due to the shallow mucky shore and even with a raft the fish are pretty small(nothing over 10"), but there are lots of them. We typically stay away from Fish Lake until after August 1st due to the bad bugs and this year seems to be worse than normal. The temps stay cooler than anywhere in Big Creek from our experience.
For quality of fishing I would choose Vines or Cabin Creek over Fish Lake. I am friends with an old timer who has been fishing Big Creek for over 50 years and has a secret weapon available at any tackle shop that makes the 20" cuthroat race to strike but if I told you any more he might kill me

. Let us know where you decide to go. The Salmon were in Chamberlian Creek this last weekend just over the bank from the airstrip so you may see some in Big Creek also.