Azima, Zenistar, or Sigma & Octantis?

[JoeKars]

I'm gonna need to chose one as a login reward soon so which one should I pick?

[Pakaku]

Azima has a little turret gimmick, but it's not very strong. It's the weakest of the three choices here, but it's also technically the first one you would get if you couldn't choose

Zenistar has a gimmick with leaving a flaming disc on the ground, but the disc duration relies on the combo counter, so it's a bit limited depending on how you play

S&O has a shield-throw gimmick that used to be exclusive to it, but the Cobra & Crane got the gimmick, so there isn't really anything special about it now

Once you get access to the Zenith, though... that thing is a powerhouse rifle

[Blaydon]

Originally posted by Pakaku:

Once you get access to the Zenith, though... that thing is a powerhouse rifle

you don't get Sigma & Octantis until day 300, it's most likely they grabbed Zenith on day 100 (the first time you get to pick a Zeni-Weapon)