Nova sorc vs meteor fireball sorc
Assuming both has no infinity, no torch and anni, around 3-4 skillers, both have sunder charms btw, both reach 105fcr
Nova sorc: shako, viper, crescent moon, frostburn, arach, spirit monarch, +3 lightning skill amulet
Fireball meteor sorc: eschuta, ormus +3 meteor, flickering flame, spirit monarch, arach, rising sun
i would say their run time would be very equal
nova has the advantage of ES and being a single skill build, making it much easier/less stressful to play
For convenience, I’d personally go Nova sorc. Static field and ES synergy makes for safe farming even when surrounded. And you can use it for farming T and H Keys efficiently outside of Cows.
But for speed, I think Meteor Fireball or Meteorb might be better than Lightning until you get more gear for Lightning.
That said, if speed is really a concern, maybe just make a Javazon for Cows and the Sorc can do other farms as Fire.
(Build links below are Maxroll dot gg d2 planner links–)
[Assumed] Your Lightning build - ye0106la
[Assumed] Your Fire build - wh01069g
Sorry if I got something wrong with Nova. The skills are just a setup I go for an early Key-runner.
If it helps, I chucked your listed gear on my nova sorc and recorded a brief cow run for you.
shako, viper, arachs, crescent moon, spirit, marrowalks, frostburns, +3 lightning ammy and two 10%FCR rings. 105FCR, 4 lightning charms, no anni/torch/infinity. Didn’t have a sunder charm as I’m non-ladder but I don’t think that’d help much with cows?
She felt a little bit weak but not too shabby considering no charms, some of the resistances need some work but she feels playable on p1.
https://i.imgur.com/6cP8S84.mp4
Yes, she is playable right now up to p3, except when there are TZ on andy and trav they still rape me hard. Cow p1 clear is decent but to be honest, for rune farming, hopping into a p3 game to run arcane sanctuary is better.
Probability wise, being able to run trav on p1 will be the best because their probability on p1 to drop HR on par with cow/arcane on p5.
So what’s your conclusion at that gear level? Which one has faster cow clearing?
Oh I’m not the right person to answer that sorry, I don’t really get deep into the mechanics and comparisons between builds. As long as something dies after I cast a spell, I’m happy. 
I just wanted to pop up a video to show the clear of your proposed getup but didn’t realise you already had it.
My guess is the fireball meteor is faster at that gear level, especially for P3.
Nova is generally low damage, so takes a lot of gear to have good clear speed. If you combine static field, you might see faster clears, but it plays a bit awkward.
At p1 I discover that it takes almost identical time for either nova or static field to leave cows to half hp, so I exclusively use static field when tele into a middle of a pack to draw aggro, not to deal damage. Guess on p3 and above, static field will be more important. But I don’t dare to run anything other than arcane on p3. You know, shared loot system sucks.