There are many guinea pig dry food mixes that tick all the boxes. There’s no specific brand that can be said to be better than all the others. It' more a case of looking out for the not so good ones. Check the ingredients, and reject mixes that include artificial colorings, sweeteners, and other chemical additives.
Dry food is not the end of the menu, though - all guinea pigs need a healthy mixture of hay and vegetables to supplement the dry food.
Don't limit your guinea pigs to dry food only - they enjoy a wide and varied veg-based diet
Some vegetables and fruits are better for your guinea pig than others. Check out our guinea pig food list for more details.