I think it is more important to know what you are looking. For one thing, there is a size difference between all three and with greater size comes greater beak power. As such, the toys I give my Red bellies and the toys I give my Cape vary, as the Cape could destroy the RB toys with more ease. As she likes to be challenged, she gets toys that are harder to destroy.
In terms of personality, I find all my Pois to be a bit stubborn, which I like. They know what they like/don't like.
My Red bellies, especially the male (Joey), are little clowns and like it when you laugh at their antic. I would say the female (Pixel) is a little smarter than her brother, and there is some thought behind her actions.
I don't expect my birds to use human speech, and while some of my smaller Pois do say a few words, it is not their thing and that is totally fine. Léa on the other hand seems keen to want to learn some words and although we don't do any particular training to get her to speak, she is picking words and using them in context. She's built a few (very) short sentences and they made sense. She doesn't really repeat them on end, she uses them when she wants. Again, there is no expectation from us but it is always entertaining when she lets us hear something new.
All birds are susceptible to have a "terrible twos" period; out of the Pois I had young enough to see them go through that phase, the little ones weren't too bad. But Léa - she ensured it was a challenging time. She's now 6 and has calmed back down, and loves to sit with me and get her head scratched. Actually, all of my birds like that activity except Petey, who really likes my SO, so goes to him for attention.
