Assuming the most popular server wins
the poll and eventually becomes full/is locked (meaning no new players will be able to join) would you be willing to switch servers?
Like the Taiwanese version, the Korean version also had a pre-event in which players were able to create characters before the servers opened (this event lasted for 2-3 days). This means players had 2-3 days to fill the servers, so then when the servers did finally open the most popular one ended up being locked in only a couple of hours. Moving from that server wasn't difficult however due to how few of us were able to participate in the pre-event (because of the newly added cellphone authentication) and because of how fast the server filled. The few players who were able to make it onto the locked server didn't have very much time invested into their characters and had no problem switching servers.
The Taiwanese version is still a bit different though. This pre-event will only last 6 hours and everyone will have the option to participate (although some still might not due to time zone differences). Because this pre-event is shorter, it will mean that the servers will not fill up as quickly which will allow more users to join in at the beginning of the beta and possibly days into the beta. Players may then have much more time invested into their characters before the server fills and will be less likely to switch over to a new server. Of course, this is all assuming that the server does fill and is locked.