Also DayBreak, the company that is charge of aion classic kinah EQ2 really doesn't care about its player base as much as Blizzard does to WoW (aka, micro transactions, p2w mechanics etc) which is why they are using it as a cash cow to ensure they stay in business more than it is a method to attract old players or attract new players to the game that is currently riddled with issues on live and plagued by numbers and mechanic bloat.

Though I'm not sure what the limit is I play on Siel server at Aion Classic. It's very busy both day and night (I'm NA East). It's a lot of fun, and it's highly populated with EU and NA players. I would recommend joining us. :

After a closer investigation i am not joining, mainly because of the company behind aion. It wont be fun to keep up with the others as i am not a whale. Even before I could even think of doing so, the result will end in death, most likely.

The Elyos are also sources of trouble for Asmodians in Heiron. They even go as far as gagging the people who cultivate Aether through a gate. If you were to gain an advantage, why not take it.

Retail is now an entirely new game. Anything you played with as when you were a child is still around and I don't recommend it. I've discussed the main differences in my comment history If you're interested in knowing what changed/happened.

Classic is an excellent choice however, since there are only two servers they are still balancing out. Siel is more pop-y and heavy on asmodian, and they control the majority of the abyss. This makes it difficult for them to farm AP often due to it.

Israphel has less pop and is more elyos-heavy. They control about 50% of the abyss, and the remainder comprised of balaur and asmo and balaur, making it more easy to earn AP. NA is my favorite, however I prefer playing during EU times. While it can be sometimes quiet but I've never had difficulty finding groups.

Israphel's dead, as of now. AP farming is easier since forts are spred. However, the same 5-6 players will continue to work every day to farm guards making it difficult to earn AP when you are at level 45+.

That's precisely why I try to breathe some life into it. There are at the very least forts to capture/lose. The only thing I know about Siel is that the asmos have buy aion classic kinah eu a firm hold on them and will not let anyone escape to take a look.