What units to use as games goes on

[rollems]

yes i have seen the KBap info.
i have have access to all companion except Gaudi.
my character is paladin hero, my current army is all human with drgaon support. little griffin/troll use also. so i am kinda confused which one to go with, as none of them help me. so as of now went for moro dark for +3 attack.
so am i ok doing this ? shall i later switch to gaudi ? will all human army fail later game making me move to black night stuff, where moro dark will help better ?