[Sombre]

I believe anathemant dragons are more likely to suffer afflictions from old age, since fire magic reduces their maxage considerably. I could be wrong though.

Both are cap only, correct?

Anathemant dragon upkeep = 11
Warlock upkeep = 18

Pretty sure those figures are right. So if you consider that the anathemant has about 75% the research power of the Warlock for 60% of the upkeep cost, in the long run the anathemant is clearly better. After 9 turns the anathemant dragon has made up the cost difference between himself and the warlock in terms of upkeep, however being out of pocket early in the game often leads to reduced gold income from expansion.

They're pretty even all things considered.