I'd say Durant...
On these kind of scenarios, skill is a factor but the main thing for this is the "killer instinct". You can see it in Jordan in last shot scenarios. The hunger that he wants the ball in his hands.... It is instinct for him and those things can't be learned comes naturally in a person which for me Lebron is lacking that. He can learn it in a certain degree and be more confident but I just can't trust him.