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The true answer to this question is; whatever you like!
Daggers are more sought out for Pve due to the extra crit damage while axes provide a bleeding effect. I personally use 2 daggers because the crit in my opinion seems like it provides more dps than the bleed does.
You can mix any one-handed weapon for DW, and may be beneficial based on the weapon stats offered and how you align your character with those stats.
I prefer daggers because watching the animations with axes just looked... weird, especially when there's no point to the axe actually striking the enemy.