Choosing RAM for MSI Z97 Gaming 9 AC.

Please Help me for

Choosing Memory Ram For MSI Z97 Gaming 9 AC.

i plan to buy Memory RAM 8GB (dual chanel)

- Corsair (2x4GB) CMD8GX3M2A1600C8 (Corsair platinum)

or

- Corsair (2x4GB) CMY8GX3M2B2133C9R (Corsair Vengeance Pro red)

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which one is better ???

i use procecor i5 4670K (devil canyon delay release :[pouts: )

or are there any other suggestions?

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*My time is very narrow for choosing ram*