4gb x 4 vs 8 gb x 2 in z77( dual channel), which is better?

Can't decide on it. I know 4gb memory have lower latency but having 4 sticks in dual channel is really better than 2 sticks?

Ps: this is my first built.
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More about dual channel better
  1. 2 sticks are better than 4

    Many memory controllers run at their top rated speed with only to sticks , and default to lower speeds when you add 4

  2. Thanks!
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