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If not, can EU playeres play on US servers at all? If not again, what is the most popular EU server?
Both clients get access to both US/EU servers now. Think EU -> US transfers aren't allowed though. Both Karak's.
US Badlands is the most populated option. It also has problems because of that though, but it's far above the others in pop.
Go Karak Norn, especially if you're Order. We need all the help we can get! Very populated server in all tiers. Karak Azgal is equally as good. Both Euro servers. Badlands is overpopulated, i wouldn't go there even if i was from the US.
EU-Karak Norn and Karak Agzal are both very high pop.