I disagree with all the people who think that Super Sonic is a ripoff of Super Saiyan.
It's not, for these differences! 1. Super Saiyans could activate their Super Form whenever they want. Sonic can only activate his Super Form when he has all 7 Chaos Emeralds. 2. Super Sonic is practically invincible in his Super Form and doesn't take damage normally. Super Saiyans, although stronger than normal, aren't invincible and can still be damaged and injured by conventional means. 3. Super Saiyans have multiple different stages to it, like Super Saiyan 2 and Super Saiyan 3. Super Sonic does not, just one Super Form that's ultra strong.
Dragon Ball Chapter 317 was released April 1st, 1991. It was the chapter where Goku first turned Super Saiyan against Freeza. Sonic the Hedgehog 2 came out in Japan on November 21st 1992. They're both based on the same concept anyways.