There is not enough of a substantial portray for Sanji v King to occur above Sanji v Queen, odds wise. Let's for example see what Perospero does first, and we will recap the situation. From a plot perspective Sanji v Queen most likely bears a lot of potential significance, at least apparently. And Drake could fit too.
Finding out how healthy/fatigued the characters are will possibly not be detrimental, since I doubt Oda will necessarily force power level dynamics too much. But maybe if he really wants Sanji to take on a big folk, he could contrive them enough. It already happened with several character in Enies Lobby, no shame about it.