[ivra]

Quick Answer is that the Archdemon wins over the Emerald Green Dragon. The long answer is documented in the attacked Excel file. All calculations are done using average damage (including average crit). So if you do 100 000 battles between these two combatants the values in the Excel file should be relevant.

Oops, I forgot to include resistance. But since the Archdemon has a higher physical resistance than the EGD, it does not affect the result. All calculations are done with 0 in resistance for both units.

Just a comment to DGDobrev's "while the Archdemons don't have anything to show for against the poison damage". I think it does; its Restoration ability let it clean itself from the Poison damage so it never takes any additional damage from poison or fire, which is normally where you really hurt a stack.