under the hood - isnt Atahualpa better?

I love Atahualpa and believe that a lot of work has gone into making it fast, optimised for seo, compatible with browsers and plugins etc. If themes created with ThemeFrame will inherit all this good ubder the hood functionality I will buy it. Otherwise wouldnt I be better off customising Atahualpa?
And since Atahualpa has such fantastic customisability (which I presume themes created with Themeframe will not have) wouldnt advanced clients also be better off with a customised Atahualpa?

Can Themeframe create child themes for Atahualpa??
Or why would I choose it?