i air dry and flat iron my hair. which of these heat protectants is better?

the first one is silk elements heat protecting spray
it has really good reviews
http://www.sallybeauty.com/heat-protection-spray/SBS-373269,default,pd.html?cgid=Hair04-15

the second is a generic of chi silk infusion but it has the same ingredients so its just as good.

http://www.sallybeauty.com/GVP-Silk-Remedy/SBS-264264,default,pd.html