Best sub weapon?

Arrow or dagger?

 

I'm super biased, but Two-Handed.

Arrows seem to have a fixed 70% ailment inflict rate with their skills, but they have access to Arm Breaker.
Daggers have 100% ailment inflict rates, and that's more or less all they offer.

If you're Dragon Tooth, go with Arrows or Two-Handed.
If you're Strike Stab, go with Dagger.

 

You forgot about the stats on em true on the strike stab thing tho, you aren't really gonna need ail unless you're going stab build.

Imo what subs have to offer is:

Arrow:
longer range if you're gonna use a combo starter from dagger or shot skill tree.
Chimera arrow has decent MP if you lack MP in your build.

Dagger:
Welp, nothing here for DT really EXCEPT Cdmg3% cdmg+3 on odd shaped knife, which is +9 cdmg on a full str build SO DAS GOOD.


Also personally don't like 2 handed on halb since only significant thing you'll get out of it is stability+5% which is 2.5% on graze and halb is known to be an u l t r a g r a ze m a c h i n e

 

i use both.
arrow for longrange. >moeba opener
dagger for its stat. but never use dagger skills.