I'm Nikephoros, Ambassador of Armata Brancaleone (AB) and i think that clan servers should be first choice (first map on one, second map on the other), and that official servers could be used only if BOTH clans disagree, as a last solution.
Official servers should be considered only in case of EXTREME disagreement. Normally, if there's the case of two clans with their own servers, and with a civil behaviour, no one will protest or whine if one round is held in one server, and the second on the other. It's still a good news for those clan who don't have a server, they may rely on it for the tournament.