The huge difference between smaller parrots & larger is that beak. The larger parrot beaks can be dangerous, and inflict a lot of harm. My sun conure actually bites me more often than my larger parrots combined. He is also a bowl flipper, and can be quite challenging. He’s a lot of personality packed into a little body. He’s a snippy little boy. He is also very trainable like the big parrots. Training wasn’t really a thing when I had my budgie. The internet wasn’t really a thing either. So I can’t comment on how they differ from larger parrots. My conures I can though.