Either normal or like 10x easier.
1- Normal: You can see how you should exp when the server comes out, what you can/should kill , whats suits the best for your clan. Downside- You won't get high levels so you wont be able to kill the big bosses.
2- 10x - You can still see what you should exp on but it'll be faster so you can get to kill some mobs and pk with high lvl. Downside- No low lvl pking.
I'd choose 10x(or something like that)