my totally anecdotal experience has been: anytime you see a person complaining about their duty finder experiences it turns out they're on Aether, so take that as you will.

The two data centers should be identical from a technical perspective, they're not located on different coasts or anything like that, same ping to either of them. It's just a split in the NA playerbase between the two, but in terms of avg. data center population I think they're about equal there too.