Aion Classic will launch with two North American servers, Siel and Israphel. Both are located in Virginia, so your choice does not need to be based on geography.
Starting on the 16th, you will be able to download the game and reserve a character name. However, each account can create only one character during the reservation period. Choose your server carefully, as you may not be able to switch after completing your registration. If you plan to play with friends, agree on a server in advance to avoid complications.
Some players have also looked at the history of these server names. Both names have been used before, so returning Western players may feel attached to their former server. The following overview may help you decide.
Historically, Siel has been the more populated server. It has attracted many veteran and highly skilled players, and the Elyos have generally dominated high-level PvP. Siel is therefore often regarded as an Elyos-leaning server.
Israphel has traditionally been more balanced. The Asmodians have often been slightly stronger and more united, while the Elyos have sometimes been less coordinated. The server has also tended to see more rivalry and drama.
Overall, the Western player base may include more Elyos than Asmodians. Long-time Asmodian players may once again find themselves outnumbered.