Koon, definitely. Cunning and intelligent seems right up my ally. Strength and shinsoo manipulation are important, but they can be made up for with intelligence. Being a good strategist and planner will mean you are useful in any team you come across, even one that has someone like you in it. Plus, I get the added benefit of +10 to my handsome.
As for organization, Wing Tree. Doing my own thing sounds appealing, but there's no reason to assume I will have the strength to be able to do that by myself. It's better to start off in an organization. Wing Tree is largely uninterested in Tower politics; their goal is one that is beyond the Tower. That appeals to me because I'm not interested in people's grudges or their thousand year old bullshit. Mazino might be a weirdo, but he's a weirdo who has the right idea.