Is it normal for spending hours of creasing in Sub-D mode, convert back to polys to add some detail, come back to Sub-D and have all the creasing lost? I still see the heavy bolded dotted line in the Sub-D model but the creasing is gone. Very frustrating.

I find myself in a huge dilema between using Poly - Sub-D, and just using Poly with Poly Smooth Proxy. I never know when is the best situation to use which method.

I try to stick with Poly as a final stage for texturing as Sub-Ds have apparently issues with texturing.

Any thoughts? What's a good work flow to follow when modeling such as saving poly model as backup or different versions of a model during various levels of completion...?