Many folks recommend Tops or Harrison's among others. Parrots can be extremely fussy, so the "best" pellet is the one your bird accepts. I'm a fan of Harrison's conversion techniques, should work regardless of brand: https://www.harrisonsbirdfoods.com/using-our-foods/large-bird-conversion/
In your opinion, how long does it take to convert your bird using the Harrison method? I have a Scarlet Macaw that still loves seeds and wondering if she will be grouchy or more of a handful during the conversion period. Thank you