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Dark Phoenix from X3 vs. Graviton from Agents of SHIELD. Fight takes place in NY Times Square. Starting distance is 5 blocks apart.

Does Phoenix turn Graviton to dust or does he crush her into a ball?

Or absorb

Well, Graviton could turn parts of his body into those gravitonium tendrils, and he swallowed up both people and aliens with it.

https://static.comicvine.com/uploads/original/11122/111220339/6436259-4081760633-giphy.gif

As to the OP, I would back Graviton for one big reason. Both characters have really good damage/power output, but one of them is kind of a glass cannon, and it isn't Graviton. So, I feel like he has a better shot at taking Jean's attacks than the other way around.