The first one is easy. Nearly every animal would be better off not being born. Not many animals have an easy fun filled fulfilling life. Most of them spend their days hungry and scared, and their last day is often being eaten alive or some other miserable death.

The second is also easy. Nearly every animal that is farmed has a much better life as livestock than as a wild animal. Want your last day to be a bolt through the brain after getting to gorge on food for weeks, or chased down and your guts ripped out and eaten while you're pinned down in terror?