There is also Fire/Poison Mage as one of the choices in Mabinogi. We can not really tell you which mage class is better than the other. It really all comes down to your playing style and what you prefer. Typically, those that like to lean more towards a damage-dealing class(Mabinogi money) will choose I/L as it can freeze mobs and has a considerable amount of damage to it.
On the other hand, clerics are party/support classes which basically means that throughout cleric, priest, and bishop you are rarely the attacker with the exception of bishop training at skeles and so on.
When it comes down to which would level(mabinogi gold) faster, we are going with clerics in the long-term run. Once you have your Holy Symbol, you will be training a lot faster than I/L theoretically. We would recommend searching up some YouTube videos, just to get a feel-see of their skills and see which type strikes you as more fun.
