I made the decision while I was researching, putting together a biz plan. My mother has been in biz for 20+ years, offered some valuable insight. We're a sub S corp. Easier on the taxes, good liability shield.
The biz has been an S corp since day one.
If you're a sole proprietorship, as soon as you're ready to not have all of your personal wealth up for grabs should someone decide to sue you, that's when you should incorporate.