why not both? Sanji vs King is already occuring in the manga. The way I see it, King underestimates sanji and sanji will take advantage of this and use it to land a powerful attack on him, damaging him seriously.
Then king gets serious, uses DF awakening to tank the hit, and takes out sanji with his sword. Then Zoro v king proceeds.
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But overall, I don't think Sanji vs king ends next chapter. I think we'll at least get to see sanji do some damage before the fight ends.