Board Thread:Site Discussions/@comment-27368475-20151218170323/@comment-679780-20160621204122

Flash can go... bazonkas fast. You see, Sonic's speed is well established, even when it is exaggerated in dialogues and such.

The Flash however, his powers come from the "Speed Force" a sort of quantum energy that surrounds the DC multiverse. It can be visable as yellow electricity when Flash is running fast and protects him from all the logical reasons why anyone would die from such speed. The Speed Force also grants him accellerated healing, stamina, brain functions and can even throw lightning created from his own kinetic energy.

If you watch Death Battle then heres a video of Flash vs Quicksilver which better explains the Flash than I can.

Think of it like this, Sonic's superpower is natual superspeed while the Flash's superpower is everything else around him appears to be super-slow. Since the Flash has the Speed Force, it powers him, protects him, allow him to weaponize kinetic energy such as creating lightning bolts and able to run on clouds because of science fiction logic. He can also phase through matter on a molecular level, change history and do whatever the writers want to do with the Speed Force. Some DC comics had him beat Superman in a race.

I can't really say if Sonic does have mental-speed faster than the average person, but we do know from actually playing as Sonic is that he may not need it given if we can time Sonic to take turns, quickstepping or stopping before danger with just out gamepads, then Sonic can just as well respond to these moments just as fast as we can. If anything his reflexes will be a little more intuned with his speed due to his full body speed while we merely control him with gamepad.

As for how Sonic survives the sheer speed from moving to fast, well perhaps the answer lies in his blue, streamline quills which is often believed to be part of his super-speed mutation/birth.