The people talking about 1,000,000 vs -175F or if he can put more heat then cold. I think that is the wrong way to compare this. It has nothing to do with who puts out more number wise. Iceman powers dont work that way. Even if he had a limit to how cold he can make something does not mean he could not slow the molecular level of a 1,000,000 F to below Zero...
Iceman every single time, effortessly. He is beyond the Human Torch etc.
He can control chemical reactions etc. Johny cannot even flame on if Iceman felt like it.
Sunfire is an excellent example. He couldn't power up because Iceman didn't allow him to.
Anyone who thinks Johny Storm has some sembleance of a chance doesn't know a lot about Bobby Drake.