Which came first: Upfront Builder or Blog Templates?

I am attempting to create various themes for use with my multisite, that users can be assigned with Pro Sites. When building these profiles, what is the correct way to manufacture them, and then place them into the 'system' for use with Pro Sites?

Create with Upfront, download created theme, deactivate upfront builder, upload into Blog Templates OR Multisite Theme Manager?

Sorry for the confusion, and thank you in advance!