Easiest? That could be debated until the cows come home :)

Suggest sticking to one and learning that. I used Truespace for years but then for various reasons I found I needed to translate to another so went with Blender.

Face Putty starts with a fully zeroed figure but yes you can easily dial in your morph again. Just be aware that unles you undial it again it will get included in any new morph you create.