The Flash vs Superman

On one side, we have the Scarlet Speedster himself, The Flash. With his superhuman speed and lightning-fast reflexes, he's one of the most formidable heroes in the DC Universe. But is he truly more powerful than the Man of Steel?
On the other side, we have Superman, the Last Son of Krypton. He's faster than a speeding bullet, more powerful than a locomotive, and able to leap tall buildings in a single bound. With his incredible strength, heat vision, and superhuman abilities, he's been saving the world since 1938.
We will let the viewers decide on who they think is the fastest