I have tried both.
Mixed chicks was good for my hair, I have thick long hair and it worked to give me some hold when I used it with some of my other products, I also liked that it helped keep my curls in their well defined spirals I didn't get any build up and it actually lasted me a pretty long time.
I tried the Mixed Silk hoping that it would be as good...it wasn't. It is thinner and it doesn't give me enough hold and definition but I use other products with it and it works well enough but I wont be buying it again.
I am actually stopping in Florida next week on my way to other destinations and I was thinking of trying out another leave in...I have no idea what to get, there is so much info on here and so many products!