Posted Jun 15, 2015
The main differences between male and female Cockatiels is that they are different in color patterns/visibility and the ability to speak.
The male Cockatiels have brightly colored cheeks, mostly yellow, with bright red circles under the eyes. They also have more color on the body, though it's mostly only visible if the bird's body is gray. Though, white Cockatiels sometimes have bright blue feathers in their tails.
Female Cockatiels are very dull in their coloring, having no yellow on their faces and very dull red circles in the same areas as the males. If a bird of female and bright color is your type, I would recommend the white version of this breed.
Also, a male Cockatiel is the only one with the ability to "talk" or mimic words. He can learn very quickly, but his memory is limited, so there are only a few phrases/words he can remember. He also does not forget these in order to learn new phrases, so whatever he picks up on/you teach him is more than likely going to be the only things he will ever say.
Female Cockatiels do not speak of their own accord. I believe there is a procedure you vet can perform to give them the ability to talk, but there is no guarantee that she will pick up on it, unfortunately.
They are both very good birds to have, though I found the female to be more timid of humans. The male was my best friend until he passed away a short time ago. The female followed suit out of loneliness, unfortunately.