Wizard will deal more spike damage than Psy, the famous combo 'Undine Strike' + 'Spark' (genie skill) will lower your fire resistance close to the 0, so if you got for example 75% fire resistance and after this combo it got lowered to 10%, you will receive about 3x more damage for a short time. And they still can combine it with Enrage / Extreme Poison and they can crit or do it under a third spark. R8 did not change much in this case. R8 has its advantages and has its drawbacks, for example you will get more atk/def levels for sure, but your crit will go down, cast time / atk speed slow down and you will lose considerable amount of stat points. Dragon Gear is balanced and provides fast cast time and atk speed, lots of crit and stat points, but R8 has the use for special builds, for example purify spell on magic weapons, more atk levels that would suit very well for DPH play style and more def levels for a tank builds. It's expensive though and need quite a lot of luck to roll the decent stats.