The thing about being an elf, the elves there were all controlled by vengeance. they were reborn but not themselves, if I recall weren't they fully controlled by their anger and just couldn't do anything? and i'd rather not become a child soldier like that one diamond kingdom guy was (it's implied that there are others), I can't really be a witch since I'm a guy and I don't feel like having to deal with demons. heart kingdom is good but I am bit unfamiliar of it.
so I choose clover kingdom, at worse I get stuck in black bulls but even then that guild is pretty good in my opinion