Best option for fighting partygame?

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Hi!

So, let's say i have a 2D fighting game for 2 to 4 players, already done (mostly...) that looks somewhat like super smash bros, the characters are using Unity physics, rigidbody and all, to move ( AddForce is everywhere ) so no deterministic physics...
What would be the best tool to make it a networked game? PUN / BOLT / Truesync? (i would have to change all the physics components for that last one i guess...).

thanks for your answers!