Stop with this who's more famous crap. Everyone will have s different answer for you. People sitting at home answer these questions, not an all knowing super computer.
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Sonic would be known to more people, especially in the US. The Flintstones would be known primarily by older TV viewers and those who were kids in the 1960s. Well, it is a deep, complex decision but the evidence clearly veers to the side of SONIC THE HEDGEHOG
Superman
Superman.
Superman is more famous, in fact the Superman symbol is the second most recognizable symbol on Earth.
They are equal