Probably the Jedi.. barely against the Sith. You know, like always?
Everything else has powerhouses to be sure, but Star Wars skips all those big scary Gods of Light and Dark and gives all that power to very trained individuals. Please refer to what it takes to actually become a Jedi, even moreso one of reknown.
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As there can only be 2 Sith at any one point in time, I'd say the Sith actually finish a lot lower in an all-out brawl, especially if the pre-fall Jedi gang up on them.