Originally Posted by
Shuuli
The difference is that res is a useful skill from the point you get it until max level. You use it in level 90 dungeons and extremes and even in raids as a last resort. Res is often mentioned as summoners "tool" that makes it the lowest magic dps now, next to its extreme low complexity of spell rotation.
In addition red mage also has a healing spell and is never turned to healer... and even though it has a longer cd and lower potency time, the RDM spell is 100% more useful for the single reason that summoner Physick scales with Mind, while summoners main stat is Intelligence so this spell never scales... for red mage this is not the situation, the heal is actually potent and is used by people.