For my 4a hair FSG is a better curl definer than AVG. it may provide more hold too. My recipe is 1/4 cup FS with 2 cups water. I also add (but u can skip) 1 tbsp each jojoba oil and glycerin. Google FSG. There are various recipes online.
Update. Today I used 3 tbsp acg mixed with 1 tbsp jojoba oil and used it all on my soaking wet hair as a styler (after cowashing and conditioning hair). I will say it defined my hair as well as flaxseed gel but flaxseed gel gives more hold. FSG had a bit more of a crunch factor than AVG.
I would say that FSG is better, however, it has medium hold and for ME made my hair crunchy and dry...for moisture I prefer aloe vera. If you are going to go with flaxseed gel, make sure that you add moisturizing ingredients or humectants like honey in there.