Try getting both. A complete warrior should, ideally, have all three weapons: 1h, 2h and DA. They all have their specific purposes.

Dual Axes have high damage per second, and can stun and inflict bleed status. 2h swords deal out massive damage, but their hits are slower.
EDIT: if you don't plan on farming too much, you can just go 2h. That's what most people choose.