IMO chickens are as good of quality. They are factory raised on a diet designed to make them grow fast.
Many spend their entire life in a small cage barely big enough for their body, but it doesn’t allow movement. Through genetic breeding the breast gets so heavy their legs can’t hold them up.
Far different then the chickens we had when I grew up.
There is a big difference in flavor and quality between brands. The generic house brands on sale can be awful. After getting a particularly bad house brand sale chicken I only buy Oregon grown Foster Farms. Eggs are similar but you usually never get bad ones, just not as flavorful.
And yes, it is dependant on the quality of feed.
Chinese raised chicken will help clean up China. They will feed them the toxic wastes we ship to them and send it back in a chicken. That way they can put the USA label on it. Semi/sarc