To curl or not to curl? That is the question. Keratin treatment vs natural curls

I saw this amazing hair transformation yesterday (don't tell my husband I was watching The View!) and I loved this comparison of curly vs straight hair on identical twins.

You can watch the video below for the full how to but my biggest tips from this are to move away from shampoo if you have dry / curly hair and use a sulphate free shampoo (which I am about to look for online now!) and to convert your curly hair to straight try a Keratin treatment. Much better than the old Japanese straightening technique as it is wears off rather than growing out . Nothing worse than a fuzzy hairline and straight locks.

Which twin do you prefer? Annamarie's natural curls or Ginamarie's poker straight locks? What would you do?