Looking for an active server

[Vhailor]

XIV Soul should never be used as a source.

OP, you want to see which servers are most active? Just take a look at which ones are not available to transfer to during most of the day. It's those.
You'd have to get up in the wee hours of the morning to transfer to them, however.

Though sadly, even this indicator might be substantially flawed. If I remember correctly, SE tallies server "populations" by character numbers rather than account numbers, which is an obscenely stupid thing to do. So it's quite possible those character creation lockouts are being generated by people creating a ton of alts. That said, it's probably one of the best options available, flawed though it may be.