Our horses are 20, 22 and 28 years old and two of them need to regain a lot of weight. Our vet likes Purina Senior Equine, but he said Safe Choice is good too. We didn't ask him about Nutrena Senior. The guy at the feed store said they quit carrying Purina because they started getting moldy bags in and Purina's customer service (to the feed store) had gone way downhill. Has anyone else heard about any issues with Purina's quality control? The feed store guy also said Safe Choice was selling like hotcakes and really bragged on Nutrena feeds, both SC and Sr. He said the main difference between them is that the nuggets in Sr. are more easily chewed and digested by older horses with possibly bad teeth. He also went on about Nutrena having more strict guidelines on amounts of specific nutrients. He mentioned lysine and some others I don't remember. That part kinda went over my head, but it sounded impressive If someone could explain to me about the -ines and other stuff I'd appreciate it. We'll see our vet tomorrow (or at least my parents will) and ask his opinion again, especially in light of what the feed store guy said about Purina. I wanted to see if any of you had heard the same thing. Maybe the feed store guy was mad at Purina about something totally separate. Oh, and of course there's a little price difference. I think he said Nutrena Safe Choice was $9.45/bag and Senior was $11.75. I don't know about Purina because they no longer carried it and I didn't have time to call another feed store yet. Expense is an issue since that was part of the reason my parents chose to rehome the horses last year, but they had to bring them home when they realized that they weren't doing well at the new place.