Maybe the question should be - what is better for egg production to feed humans? And not so much about the chicken as such - unfortunately they are simply there to produce a product for us to eat - that is all - of course in the process of this you never want it to be cruel but on the other hand you need to see the bigger picture and understand they are simply a machine in the process to produce a product - of course at the end of the day the better option is having animals free - but is is viable for companies, the earth etc to do things like this? Prob not.
Just like a caveman going out and killing a "defenseless" animal 100's of 1000's of years ago - that animal is simply used as meat to give live to something higher in the foodchain.