Hey there!
Thanks for contacting the Guild Wars Support Team. The key thing to realize about region designations is that after you successfully register your Guild Wars 2 account, it becomes a global account. You can roam to any part of the world and still access the game. By default, we display the worlds that are hosted in your regional data center, but you will be able to select a home world from either region at this time.
While we understand your concerns about this, we are unable to provide further detailed information not already provided on the website about how your connection will be routed if you choose to play on a server not in your region. What we can advise is that if you feel that your service will improve through a change in game worlds, please select an EU (or US) Home World. At launch, players will be able to transfer between worlds freely, so we encourage you to take that initial free transfer period to test out the worlds and see what works best for you. However, please note that once server populations have largely settled and stabilized, world transfers will be restricted to once a week and cost a variable amount of gems based on the population of the world being transferred to.
For additional information, you can review the following pages on Region Designations and World Selections for Guild Wars 2:
A World of Choice-The Regions of Guild Wars 2: https://www.guildwars2.com/en/news/a-world-of-choice-the-regions-of-guild-wars-2/
Regional Designations: Territories and Countries: http://en.support.guildwars2.com/app/answers/detail/a_id/9183
The Worlds of Guild Wars 2: https://www.guildwars2.com/en/news/introducing-the-worlds-of-guild-wars-2/
Please let us know if you have any further questions.
See you in Tyria!
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Jak dla mnie to niezależnie jaki klucz masz grasz ^^