Mario
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Sonic because he was made first and Mario is trying to copy him... Sonic > Mario, in a lot of peoples minds.
Mario came first
in the death battle of mario vs sonic sonic won by a spin dash to the back.
Back in the days SEGA and Nintendo were like mortal enemies. But Sonic and Mario were concidered to be enemies. But know like in the 2006 and up, Nintendo and SEGA teamed up and that's how sonic came in Brawl and Mario and sonic at the olympic games was made. And that means Mario and Sonic are friends.
good question I think in the first sonic and mario game,or youtube