Voltaic tempest vs. Ash of agni.

I already have a freezing atomizer, I am wondering which one to pair with it. AoA or VT. I realise that ash would be more damage while voltaic tempest would kind of be a mix betreen SMB and AoA. Thoughts? Don't worry about the bark module or anything, just tell me which one is greater. 1 thing goes to VT, It looks frikin awesome.
I have smb, aoa, and vt. I pretty much always run with vt +
Most maps I go vt + aoa for more damage tick rotation, in fsc I run vt + smb since everything is immune to fire XD
I really think shock is an underrated cc, and the damage from shock is elemental damage type too.

I'd like a couple more opinions on this.
Shock is WONDERFUL against crowds, when an enemy is shocked or is afflicted by shock, any surrounding enemies also take the damage tick. I have a Plasma Capacitor, and it does like 30 damage in the FSC per tick, which is quite a bit more when there's a crowd of zombies. It comes with the drawback of shocked enemies can't be shield bumped sometimes.
I have all the Vaporizer bombs, I'm gonna have to say that while Ash does more damage when enemies are spread out, Voltaic Tempest has the temporary paralysis going for it. Depends which one you'd rather have more.
(On a side note, Shivermist Buster goes better with a Venom Veiler or a Haze Bomb, it doesn't thaw them.)
The Voltaic Tempest is meant to be the go between of these two bombs. If you already have a Shivermist then you want to no doubt pair it with the Ash of Agni. The only time you want a Shivermist and Voltaic Tempest combo over Shivermist and Ash of Agni are in Fire themes levels such as FSC where the Ash fails to bring out its highest damage. Also Freeze doesn't pair up too well with Shock unless the enemies are close to each other whereas the Fire would bring on damage (more damage than Shock mind you) regardless of the mob's positioning.
While shock breaks ice, so does fire... but shock maintains a form of cc, and a pretty good one. Many consider ice the strongest, but mobs under ice can still attack - and if they're throwing things it's hardly a cc at all - where shock can interrupt attacks, and maintains effect through all damage.
Especially when it comes to fsc - shock is elemental so you're getting about 30 damage per tick. That's about 1/2 the fire bomb's tick, but with it you get a cc that keeps the mobs from advancing even though damage, and on top of that the shock tick is aoe actually granting you an aoe of effect beyond the bomb haze. Shock can even effect trojans and vanaduke.
I still think Ash of Agni is better, because of the prolonging effects of burning sustain more than that of shock.