Call me what you want for this, but I'm pretty sure the Exos will have an edge for being designed specifically for combat whilst Gen 3 Synths to my knowledge are designed to seem as if they're just normal people until you open them up.
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-blam!- destiny, but synths would get rekt
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Ok, assuming the synth is a courser, an exo would still win?
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I'd need knowledge about a Synth Courser and the exact extents of a pre-fall Exo to get an exact answer there.