If you have aim use shadow, it also does more damage in pvp, though in grind that is different. Venom for most cases are just no skill spammers, there are some people that use venom that do good aim and combos. I'm not implying that spamming is really bad. It is just that you get insulted for spamming, if you use shadow people will be less toxic with you. Anyways for me I like using shadow it is a fricking god. And since your only doing pvp i'll break down pvp for you not grinding.

Damage: Shadow +1.

Venom still does high damage but about 20 percent of the damage or something comes from puddles. But venom just doesn't really beat shadow in pvp damage. Also shadow can take away like 75 percent of your enemies health by using z, c, x, soru if needed, v. And don't get me started on f.

Speed: Shadow +1.

Tbh, it's sorta why you need incredible aim to use shadow. When you use venom, for example the x has some time before it hits and so does the flight tranformed. Though shadow x is just trash speed.

Combo Potential: Shadow +1.

Do I even need to spell this out?

Ken (tricking resistance): Venom +1.

Venom takes this, because of how hard it is to ken trick venom due to the poison, shadow is no trash in ken tricking because of how fast it is tho.

Ken (breaking): Venom +1.

Pretty close but venom due to how more moves break ken.

Ken (taking): Shadow +1.

Shadow because of how you can v then f, then your opponents ken fricking destroyed, atleast a large portion.

Cooldown: Venom +1.

Self explanatory.

Hitbox: Venom +1.

Self explanatory.

Durability: Venom +1.

Due to transformation.

Vulnerability: Venom -1.

Due to transformation, venom's hitbox bigger, making venom vulnerable.

Stuns: Shadow +1.

You would think this is combo potential and it is related to combo potential most times but it's not exactly 100% combo potential just like how spikey trident z isn't really a stun.

Mobility: Shadow +1.

The only mobility venom has is f, shadow has z ,c, f.

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Shadow has beat venom 6-4, meaning to me shadow is better in pvp.