What kind of magic do you like?

We've already discussed battles between mages one on one. (at least, that's what it seems like), let's now consider the actions of mages in battle when there are two mage heroes on each side, from different factions. Now, let's figure out which magic is better in a paired battle. I think we should consider the condition that the magic is upgraded to the 5th level (hero is level 15).
For example: Necromancer and Mage versus Druid and Sorcerer. Who would win in your opinion?