Since your talking about a full out fully upgraded army with or without caster support, I am going to say you need to look at FFA records for the answer. While you can win with any of the armies mentioned above, you are the most likely to win with an Orc caster wyvern bat army. UD and Elf air is better at killing bases and looking badass, but if you really know what your doing, the Orc army wins after a couple of fights. The orc casters really decide the fight.
Gryph hawk is the weakest imo, but gryph tank is extremely strong, to the point that you don't even wanna use air against the human.
Garg frost with hero support is the most mobile and great for hit and run.
Chippo is good, but not as good as frost garg, gryph tank, or wyvern bat.