Beiler's Bite vs Pirahna Strike?

[knightstar4]

I'm creating a 4th level monk that's dex based. While the 1st level feat is taken up by weapon finesse and weapon focus and specialization will be taken care of by the weapon adept archetype, I'm not sure whether to go for beiler's bite or Pirahna strike as the 3rd level feat. I might not be getting the other till mid levels if ever depending on how things go in the game.
In general, which of those two feats would be better to take at 3rd level? I can't decide.

Thanks in advance.

[Secret Wizard]

Piranha Strike is straight up more damage. 2 extra per hit is more than 2.5 per round, unless you are hitting multiple enemies.

[Imbicatus]

Belier's bite is unarmed only. Since you are a weapon adept, that would rule it out IMO.

However, I don't like power attack or piranha strike on monks, as they don't have the accuracy for it.

I'd go for arcane strike if possible, or risky striker if you're a halfling.