PS. I've been trying to squint and read the tags. The Tribute feed has a higher in vitamin content and contains more omega fats. So in a sense it is richer feed. It might be higher in sugar too, since it is a sweet feed. (I'm not sure if the first feed is or is not. That part of the tag is too blurry for me to see.)
I noticed at the bottom of the tag on the Carney feed it is also made by Kalm something or other, so maybe they are different grades of feed from the same manufacturer?
Anyway, I always try to be an advocate for my horses, so if you think they would do better on the Tribute feed, see if you can arrange that for them.
Thank for your replies, too! Yes, I did find out that both of the feeds are from the same manufacturer. The Carney's one is made specifically for the Carney's Feed Mill here, which is the BO's supplier. And the Carney's feed to me is not what I would consider a sweet feed, it's all just dry pellets (looks like rabbit feed). And then the Tribute is the manufacturer's brand name feed, and according to their website it's supposed to be low in sugars and starches. No such thing is listed on the Carney feed.
One of the biggest issues I have with the pellets is that they do list "grain by products" as being the ingredients and no specifics, which from what I've learned means that if say corn is cheaper one week they'll throw that in, and then if oats are cheaper or more readily available the next week then they'll throw those in. So their diet in reality could be constantly changing without knowing it.
Neither one of my horses I would say have really changed much or done bad on this feed, but if one is better than the other I would prefer they have the better one, especially since I'm paying more for it anyway. Overall I would say my biggest issue is with how the BO switched the feeds with no warning or reason and then just increased board to support this more expensive feed, without my horses best interests being considered at all and me not being consulted at all.