Our practice usually recommend the 5% foam. The regular contains an ingredient that can cause irritation in some people, and the foam is lighter and, from what people tell me, easier to use in general. You may also want to see a doctor about getting on Propecia. Seventeen is very young, and you may not be a candidate. However, we several patients of your age on Propecia because their hairloss is significant.
Hope this helps.
Head Technician and Surgical Manager for Haber Dermatology and Cosmetic Surgery