What would you recommend as the best straightening shampoo and/or conditioner on the market? Why?

I would recommend Pureology Super Straight Shampoo and Conditoner. All pureology products are thermal protectants as well as Antifade color protectors if you color your hair. They contain no alcohol which most straightening products do and it dries out your hair. Also they are 100% Vegan not tested on Animals.