1. https://www.ciwf.org.uk/factory-farming/animal-cruelty/ 2. https://ffacoalition.org/articles/dangerous-conditions-facto...
IDK if you've ever slaughtered a sheep the non-slaughterhouse way done where most of the people live (i.e. the third world). I've done it out in rural asia. You take a long blade and pierce the heart / surrounding blood vessels straight through the chest. It takes a second or two for it to pass out. The slaughterhouse is a slight upgrade with basically no suffering at the time of death as they're instantly knocked out by electrical impulse.
If I were the sheep I would definitely pick the slaughterhouse over being shipped alive to the average end customer which is someone in the third world with a long blade.
Not in total of course, but per life taken.