There is no perfect seed, blend or pellet diet for any exotic bird species. Our Senegal parrot Peaches eats whatever broken bags or tubs we get with our deliveries.
She probably has five or six brands in her food storage container currently. I even toss in large parrot food and simply crack the big nuts open for her.
Not all pellets on the same. The concept behind pellets is they are an engineered food containing 100% of all the nutrition that a bird needs. At the Hagen Avicultural Research Institute they have third generation quaker parrots who have been eating Hagen Tropican exclusively for 25 years.