I would say the first one: "Classical music is much different from big band music."
I've learned that effective sentences have to be grammatically and factually correct, meaning the sentence can't be an opinion. Therefore, the second sentence can't be the answer because it is an opinion statement.
This is part of Tom's plan to entice the other boys into painting the fence for him. He plays on their emotions in order to convince them that painting the fence is a "fun" thing to do.