What ZP Crates?!

Hi,
i'm going to buy 70k ZP and want to spent it on Crates...So my question is: What Crates should i buy?! (AK-S or M4A1-C)
Or is it better to spent my ZP's on M4A1-C Crates and exchange my coupons for AK-Camo?

Thanks for help :)

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