Crows feet always have a dynamic component, meaning they are more apparent when the muscle around the eye tightens and causes wrinkles in the overlying skin. For this reason, I would also recommend Botox, or now Dysport, as the primary treatment for crows feet since these treatments reduce the muscle movement.
However, there may also be a static component, meaning that wrinkles may be present even at rest. Static wrinkles can be treated with lasers, chemical peels, or very careful placement of fillers. Fillers need to be injected carefully in this area because there is a fairly high risk that a filler will leave a visible line or bump in this area because the skin is delicate. Either Prevelle Silk or Juvederm Ultra (not Ultra Plus) would be appropriate choices. I would choose the product that your practitioner feels most confident using in this area.