Top veterancy provides more value because it will help them be able to pull out more models, if in combat, before transformation, they already will provide fire, cc, and better AoE capabilities in their 2nd state, provided with the docs will allow them to survive even more, and let you be able to take on a lot of units (IR, avoid initial charge; Berserkers, Spear Sgts, MAA will win outright, make sure to get in there with your hero; and more). The last doctrine can be a filler doctrine, whether you want LDS, Noble Blood 1, Unit Damage V, Ying Yang (for more damage reduction at first), etc., make sure it's one of these doctrines.