Depends on the iteration. Because comic Sonic ran out of a Black hole if I’m not wrong. However, Flash in my opinion is faster, despite me being a fan of the blue blur.
SONIC CAN BREAK THE SPEED EQUATION BY THAT ONE TIME HE ESCAPED AN INFINITE DIMENSION. HE LITERALLY RAN AN INFINITE DISTANCE IN A FINITE AMOUNT OF TIME.
if he has the chaos emeralds and stuff
sonic