[zlefin]

when comparing those two as researchers, you can't just consider the cost/turn of research, as the startup cost of buying them matters too. while it's not clear how to compare the amortized cost of higher upkeep to a lower purchase cost (for higher research) it is important to consider. Overall I prefer the ministers.

I haven't played TC in awhile, but i recall the combat magic being heavily based on communions to be effective.
Geomancers alone can make for solid combat support in numbers, with communion they have a number of fine combat options, Gifts from Heaven n various others.