I don’t know about sites as I do not follow what any ratings say, that is just not how I choose my dog food.
Everyone has different budgets so it is hard for me to say what is affordable without knowing yours. An adult food could work for your dog though. Seniors don’t really have special dietary needs. Some less active ones could do with less fat and calories but there are also adult foods that are not high in those. Glucosamine and Chondroitin added to most senior foods is pretty useless. The amount the dog would have to eat just to get a reasonable amount is ridiculously high.
That said, Victor Senior is IMO a pretty affordable food with a good nutrition analysis. Good level of protein for a senior, lower fat without being too low (not enough could cause skin problems), phosphorus and sodium levels are good, good amount of L-Carnitine, and calories are quite low.
