Buy the feed you are comfortable spending money on. If they seem healthy, and not hungry or unhealthy, then you are good.
We do not feed to a particular label, but have noticed that we do not care for one brand, so avoid it generally -(based on the fact we fed our quail using that brand for a couple of months and even my 11yo noticed they looked generally unhealthy, so we switched back to the previous feed and they perked up noticeably). But, we have adjusted various aspects of our chicken keeping according to what our goals are: healthy chickens that lay eggs regularly (not necessarily every day).
We do not feed to a particular label, but have noticed that we do not care for one brand, so avoid it generally -(based on the fact we fed our quail using that brand for a couple of months and even my 11yo noticed they looked generally unhealthy, so we switched back to the previous feed and they perked up noticeably). But, we have adjusted various aspects of our chicken keeping according to what our goals are: healthy chickens that lay eggs regularly (not necessarily every day).