Zod has the same potential as Superman, but less time to adjust to Earth. Since full power Superman ended in a mutual kill(-ish state), Doomsday would probably win.
That kinda reasoning has always been flawed, as there are other factors to take into account. It’s sometimes called the coat fallacy: I fit in my coat, my coat fits in my bag, therefore, I fit in my bag.
As far as I know: Zod is a General with the same potential as Superman while Superman is a... reporter. Given the same time to adjust to Earth as Superman I would go with Zod. By logic, he should be a much better warrior than Superman, although Doomsday is a whole different kind of monster due his to his evolution thing. With some preparation, General Zod should be able to take out Doomsday
^ but he isnt. Supes grew up on earth. Zods only been there for a few years so while hes more skilled, I dont think his raw power would be the same, which is why Supes often wins. And then Doomsday just kills everything lol
If Supermam grew up on Earth and his fight with Doomsday resulted in both of them dying, imagine what doomsday would do to Zod. Maybe with time Zod could think of some battle plan and look for weakness in doomsday to make up for his lack of being as powerful as Superman
