I think the most important decision for server time event is the 8:00 one. Theres usually a event at 8:00 or 9:00 server, probably the world boss. (could be 7:00pm too))
So for me on pst my event will be 8:00pm give or take a hour. But if i choose EST it will be 5:00pm(give or take a hour)
Same with the morning, If i do pst my first boss or special event will be around Noonish. If i choose est my first event will be closer to 10:00am or 9:00am possibly. So just keep that in mind with the server event list given from the chinese/brazil? version. Combined you can make a pretty solid idea of the times that work better.
I think Schnee said it, but maybe someone else. You c*ways make a character on both servers. Check the events when you login and then pick a character!