Usually I don't like to get into this kind of dueling argument...

It depends on the player. If a Cold Sorc can play without mistake, she'll win. Likewise, if a Fire Sorc can play perfectly, she'll win. If they ARE to make mistake however....

Vs Fire Sorc, you can't make more than 1-2 mistake, because you will be on the ground if that happens.

Vs Cold Sorc, you can afford take some shards of Orb (I don't think you can actually land a Full Orb on skilled sorc...) and just suffer medium to minor damage. Cold doesn't do as much damage as Fire, and with Ravnes and other Absorbs...