I'm going to have to go with Heatley on this one -
Yashin was drafted to Ottawa; he signed the contract, but it wasn't until later that he felt he was underpaid. He tried to renegotiate properly, but in his case, it was simply poor advice that led to the hold-out. Many have said that he is otherwise a (relatively) reasonable person.
Heatley, on the other hand, has asked for a trade less than one year after signing back in Ottawa voluntarily. He signed a contract that gave him the most cash in the NHL for the last season he played, yet he wants out. This is after the team coddled him, rescuing him from his personal demons, and helping him get through his legal obligations in the least obtrusive way possible. And worse, in asking to leave, he has done so publicly, then has rejected everything that has been offered to him. And he has yet to answer the most simple of questions: Why?