check your mail.
economical and quality feeds. This would be subjective because in livestock it is the balance in genetics , feed, health management that comprises a good harvest.
You could get a low price feeds with high specs/ nutritional value but if you have a genetic which is inferior then your harvest will be affected.
Personally, as a starter i would suggest to choose the product which is well known in your area. A product which well known in one area means it have delivered a good performance most of the time.
And in your succeeding harvest you could then assess whether you would want to shift to another brand or just stay with the current brand you choose.
Usually in one area there are 2-3 brands that are well known for their performance etc.