Warrior on impossible is easiest at least timewise with different playing style

[Lari]

Having played both, i should admit that from my point of view, tjoepee is right to say that the warrior is stronger -timewise- . Overall there is no big difference, but from my esperience, it took considerably less (maybe 20%) to use the exploit for the warrior, than the exploit for the mage. Focusing first on the might tree and having a second weapon slot avaible right from the start, made the difference for me. Mage is not gimp, it just take a little more time to develop his true strenght (you can do incredible things with 2 spells per turn, even if u don't use chaos at all).