Well, the actual answer is we don't really have a way to know as we haven't really seen either of them get into it. That being said I'm pretty sure Ferrovax would get the short end of that fight pretty bad. If I recall correctly Jim has placed Ferrovax as more powerful than any one senior council member, on par with Eldest Gruff or a Queen. Kemmler required the ENTIRE WHITE COUNCIL to personally take the field, not just the senior council, not just the wardens, not just the "Archangel brute squad" but the entire white council. And that is before you just gave him another massive power boost. So I go with Kemmler as a good-odds favorite. Most likely result: neither bothers to have the fight, work out some sort of deal while waiting to try a sneaky back-stab, neither are featherweights after all, nor are they predisposed to a fair fight.