Apples and Oranges. DiCaprio is a living, breathing, flesh and blood, real person. Sonic is the figment of someone's imagination brought into reality. I suspect to the fans of Sega might say that Sonic is more popular, and within their world that might be true, but Leonardo DiCaprio does not require a team of animators to bring him to life, so may have a few advantages.
sonic the hedgehog
sonic the hedgehog is more famous
Sonic the Hedgehog
Sonic the. Hedgehog
Sonic the Hedgehog
Sonic the Hedgehog
sonic the hedgehog
sonic the hedgehog
sonic the hedgehog
Sonic the Hedgehog
Sonic the hedgehog
sonic the hedgehog