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In my opinion, the Warrior in Heroes 6 will be stronger than the Mage.
Regarding Anton's development:
Personal qualities: Education, Logistics, depending on the path, either Protector or Aggressor level 1, Training (not necessary, but I like to improve secondary heroes and then fully develop their Management skill).
Management: Anton doesn't need it at all!
Tactics: Tactics level 1, Ambush, Reinforcement to the maximum.
Spells: Harass (mandatory!), Forward, the rest is up to your taste; I didn't have much time to cast them.
Art of War: Retaliation max, Defense, Cleave, Giant Killer, Endurance max.
Light Magic: General and individual healing.
Earth Magic: General and individual restoration.
Everything else is up to your taste...
There were no problems in any mission; everyone was defeated, even the deadly ones.