Abby. She's my cockatiel, and my answer to this question every time it's asked.
Favorite domestic bird? Geese. It's not even a close competition.
My favorite wild bird has been robins ever since I rescued one a while back. Busted both its legs and was being eaten alive by ants after it fell out its nest during a bad storm. It comes back every Spring and keeps close as I garden . . . so you could say I'm biased.