I use the cream (serum) for blow-outs and rollersets. It's an awesome product that eliminates frizz. You only need a little because its concentrated. I have purchased this product many times and I am about to restock soon.
I have used both the spray and the serum. A little of the serum goes a long way. The spray made the comb on my blowdryer glide right through my hair. The serum made my hair really soft. I like both products but will probably only repurchase the serum.