...just a point of information, this is a Missions character and Hard Targets has not yet been accepted for Missions play so any of the new weapons and enhancements are not legal.
RE: Svalette Guardian: Due to only a 12 round clip, two actions of burst fire and even this character would have to reload before the end of a combat turn. I think she'll stick with the "tried & true" Predator (also costs about half).
Basically, for her the gun is only a last ditch backup if all else fails (and hopefully her sammy, mage, and/or adept chummers will get the jump should all drek break loose, and the decker already has turned off a couple of the oppos' guns while she was doing the talking).
Still not sure about the Defiance Shocker as she would need to deal with the tethered darts after the first shot. Stick & Shock in a Predator would be 6DV -5 AP plus the electrical side effect with the benefit of nearly 4 x the ammo capacity and rapid fire capability.
Difference between Predator and Savalette Guardian are a measily 150 Nuyen, thats really nothing.
Stick with the Savalette.
Burst Fire is an OPTION, not a necessity, you can always let her Fireselector stay on SemiAuto which leaves her at the same stats as the Pred sans three Bullets in the Mag.
But if really NEED the Burst because you face a someone with high Dodge or want to but a Bulls-Eye Tripple Burst into somebody to increase the AP, you have the option right in front of your face.
The thing about Tasers is, they are absolutely legal.
No SIN-Checks, maybe you could even carry them into some corporate buildings without problems.
Single Shot IS a disadvantage, but think about when you' would actually use the Shocker?
In my opinion its a Weapon for sneaky surprise Attacks on isolated targets.
One, maybe two Shots should be sufficient and thats an area where neither the Ammo capaciity, nor the wired Darts are an issue.