I've been looking at chicken feed online and there are so many new brands in the 5 years since we had chickens.
I notice some feeds are complete pellets or crumbles, while some look like a mix that includes whole grains. Personally, I would avoid the ones with the whole grains mixed in--the chickens will tend to pick out their favorite parts and spill/waste the rest. This means you buy more food, and the chickens don't get the right nutrition.