I am 47 with dry to very dry skin. For the last 2+ years, I have been using Skinceuticals Intense Line defense but this product has been discontinued. Would you recommend using the Retexturing Activator or the Obagi Nuderm Exfoderm? If I used the Obagi product, do I need to use all the products in the system? I use 20% Vit C serum, B5 serum, moisturizer, emu oil and sun screen daily.