Most active Data Center for pvp?

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Originally Posted by RoanValorin

What I am looking for is just frontline activity. I just want to rank up in the, whatever its called that gives you the crystals and frontlines work just fine for that. Thanks for the info guys.

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I'm not exactly sure how true this holds now, but in terms of activity:

Aether > Crystal > Primal

Quality of frontline games are a different story.

Frontline is Frontline. I'd just go with whatever has fastest queues. That seems to be Crystal, tbh.