VI Vitalize Peel or Perfect Derma?

Hello, I have dark skin and hyperpigmentation from picking acne over the years. I've started to treat the pigmentation and want to know how the VI Vitalize chemical peel compares to the perfect derma chemical peel. I already did one VI Peel a month ago. It definitely peeled me, but I have deep deep pigmentation and it barely made a dent as far as getting rid of the pigmentation. I know this is a long process, but I am wondering if the Perfect Derma peel is in fact stronger than the VI Peel.