Which pair of ram should I go for?

[First time pc builder]

I'm looking at http://www.newegg.com/Product/Product.aspx?Item=N82E16820104073

and http://www.newegg.com/Product/Product.aspx?Item=N82E16820231166
Which should I get thanks

 

[GhislainG]

Probably the one that requires less voltage when overclocked to 1066 MHz.