Both of them became champion in the House of Bathiatus. Gladiators who never lost any battle in the arena. But I think Gannicus is more skilled because he fought blind-folded in one of the episodes of "Gods of the Arena" prequel of Starz's Spartacus and still won.
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Spartacus would win. He has anger, passion, and would fight for his freedom and wife. Gannacus do not have any of the above.