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The difference with Aion free-to play NA vs EU is not only limited to their different business models.
So the lessons of the past that made Aion fail so badly in NA have not been learned because the newly announced rifting event is going to bring back the big ganking problem of PVP rifting that does great harm to the PVE populations.
The intention of Adam Christensen NA to continue with a failed PVP rifting system is clear where as Volker Boenigk EU is quoted: We are currently in discussions with NCSoft, to see how this system can be improved to ideally cater to all players. Both PvPers and PvEers, without having any negative impact on either group .!."
Fact: EU still has more than twice as many servers with 5 UK English alone.
This is mainly because Europeans are less aggressive where more Aion players enjoy less ganking and more of the brilliant adventure or discovery elements that devs have created in Aion.
So for those that enjoy more PVE freedom or fair PvP contests there is only one choice. Play Aion EU.