[Question] How bad is life exactly for animals in factory farms?

So I am thinking about factory farming, and especially about the lives of the animals that are getting farmed. I have heard from multiple sources, and I’m guessing you heard it as well, that A LOT of the animals in factory farms are suffering, I believe this to be true, but when I think about it, I am not very certain about it, and I don’t really know much details about it either.

Now I have watched some documentaries about it like “dominion” and “cowspiracy”, that show videos from factories, where the conditions look awful and the animals seem to suffer greatly, and when I see that, I’m pretty convinced that it would be better if those animals on the videos would not be born. What I don’t know on the other hand is how representative those videos are, but my guess is actually that they are not very representative. I believe that the creator of the documentaries wants to convey the message that it is horrible for the animals, and because of that, they cherrypick the films from the worst factories and the ones that look most horrible. Then, to get another view on it, I instead go to the webpage of the brand of meat that I usually buy, and they tell me there that all of their animals live a very good life. Now, these two pictures are basically the complete opposite, and I feel like I can’t trust either of them.

So the question I want to be answered is “What, more exactly, have the animal that I can buy in the supermarket gone through?”, like in what ways did it suffer, if any? This will of course depend on what specific product you buy, but right now I have no idea of any of the meat products I buy. I feel that I can’t really make an informed decision of whether or not I should become a vegan without this knowledge, and I’m not sure how to get it. My guess is that they suffer, and they suffer enough to make it motivated to be vegan, but if someone would tell me “no actually, factory-farmed animals do not suffer!”, then I don’t know how to argue against that.

What are your thoughts? please help me!