XM8 or AK-47?

Hello!

Sorry for asking these stupid questions, but I need advices.
Which one of the two gun choose?

I am feeling that AK-47 is more powerful, but it is harder to control than the XM8.
The XM8 is quite stable and reliable, but less powerful than AK-47? Plus, the wallbang has been nerfed. Is this a 3-shots-kill gun?

So which one should I get?
I precise that I am a run&gun style player, no spreading, just bursting.

Thanks for answering!

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