It won't make much difference which one you choose. I've tried so many ad networks, the CPMs are always pretty similar. I think it's better to spend your time focusing on building traffic and improving your site, vs split-testing ad networks.
That said, I'd start with exoclick, just because they're very reputable and have the largest RON inventory (which is what your sites will be a part of). Trafficstars/Trafficjunky have less RON inventory (they're mostly for xhamster/pornhub, respectively) so there will be less media buyers, meaning the ad zones will be less efficiently monetized.
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