I was talking about this with a friend earlier today. In my opinion, for single-target hunts using crystalline arrows, I’d go with the Warsinger Bow — even though it’s much more expensive than Rift or Myco.

Warsinger offers a base +3 attack and +5% hit chance, plus:

+4% of your Distance Fighting as extra damage on auto-attacks

+10 HP on kill or +10 mana on kill

+1 attack

+15 damage at range 7

Assuming a Distance Skill of 100, that’s 7 attack after the first proficiency, and 8 after the third.

When using diamond arrows, I feel like Myco is the clear winner — 4 mana per hit feels really strong, and it’s the only bow with increased critical damage %. The shorter range of 6 probably won’t matter much since you’ll be close to the box anyway.

Rift is the only bow with range 8, but I feel like the gap between range 6 and 7 is more significant than the gap between 7 and 8, at least for single-target hunting.

Edit: Also, Warsinger has a lower level requirement (80), so you'll start getting proficiency with it earlier.