I don't like the Kaytee pellets, especially the one with things mixed into it. I feed Purina myself (I feed one of their diets that does have corn, and my rabbits do well on it, but if that's an issue for you they have other versions that don't have corn), I've also heard good things about MannaPro, Blue Seal and PenPals feed. I don't like Oxbow either (but I do like them more than kaytee). WAY overpriced for pellets that aren't super great, imo (in comparison, purina is about $20 for a 50 lb bag). Low protein and energy so they'd really only work as a partial diet, and for low-energy use rabbits (spayed, older). If you don't mind the money and your rabbit does well on them, go ahead, but I wouldn't ever feed it. What food is best (Especially what protein %) varies depending on your rabbit. Neutered/spayed house rabbits are usually okay with 14-16%. Non-breeding intact rabbits 15-17%. Breeding rabbits 16-18%. Any breed with wool I wouldn't go anything less than 18%, they need a lot of protein for developing all that fur. A lot of people say not to use alfalfa based feed, but as long as you are not supplementing other high-calcium stuff into their diet (eg alfalfa) and your rabbit isn't predisposed to calcium buildup it's okay. Alfalfa is a higher protein/energy hay that often forms the base of complete diet pellets. My rule of thumb: if your rabbit has loose, or wet stool you might want to look into a lower protein/higher fiber diet. If your rabbit has large, dry stools you might want to look into a higher protein diet. There's no one right way to feed a rabbit, and each rabbit is different. Even within my Himalayans, rabbits of the same age, breed and sex can have different feed requirements
Whatever you do feed, make sure you change it out gradually, and provide hay as a supplement during food transition.