Seojun because of his personality and charms. He is a social student, isn't afraid of teasing his friends, knows how to care about a person, straightforward, has his ideals and hobbies, he is also really funny and at least he isn't a coward. He wouldn't be cold to people because of little misunderstandings or jealousy and he actually would go and solve things. I know that they gave him the "bad boy" type but he actually isn't one. He is also a great brother and a son...
I just like people who speak out their feelings instead of hiding. He looks like a comfortable person to be around with unlike Suho. Everyone around Suho looks tense and I hate the fact that he is so cold and mean to other people. He acts like he is the only person in the world with problems...
I know Suho is the main guy but I would still prefer Seojun...