It depends ! All 3 (GFC , AM and Burris)are good feeds. For BG all of them work well because they are all fish meal/oil based. It depends on your goals for feeding. The more the pellets are used as a primary food source for predator fish (BG , LMB , HSB etc) then the more important it is to have the right (usually higher) % protein from fish products. There is a lot of data on fish foods and results. Here is the archive on fish food producers and feed.

http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=92623#Post92623


My BG often will eat GFC over AM. When the water starts to cool they eat AM better. Both are Purina products fyi.