[quote name='VivaLaDementia']As far as I know, The Power Cosmic has never been compared to any other entity and thus makes this comparison pretty hard. Flash is pretty much useless here imo, its basically Superman vs Silver Surfer.
I want to say Superman, only because they always make him crazy OP'ed in any comic I read, but it also depends on which Silver Surfer
If Silver Surfer isn't serving under Galactus, Superman wins.
If Silver Surfer is serving under Galactus and Galactus is at full strength, thus Silver Surfer is as well, then I think its too close to call.
Maybe I'm underestimating Flash, but I honestly don't see him of any usage for Superman here. Maybe Martian Manhunter or a Green Lantern would be more helpful.[/QUOTE]
well if you want a quick run down of Flash's powers
Super strength, speed, agility, durability, intangibility, time travel, dimensional travel, control of kinetic energy, energy manipulation, accelerated healing, can create whirlwinds and wind attacks by moving his arms fast, can process information at super speed and even out think a futuristic supercomputer, can become invisible, super speed communication, can form his costume spontaneously, can summon his children to him with a Speedforce connection, can cause people and things to explode by vibrating through them, can use his Speedforce aura to envelop other things beside himself (for example to save someone at super speed without it damaging their body, or to throw a projectile at super speed)
Taken from the OBD wiki