I don't have a wide scope of experience with different species, and I'm probably pretty biased, but I like GCCs! (Lol.) I find my GCC's personality to be quite ideal for what I was looking for in a companion. She's playful, cuddly, silly, and smart but also dumb in all the best ways. I also like that she isn't very loud. Most of her vocalizations are either kiss noises or grumbles and her screeches are nowhere near as horrible or unending as the cockatiels in the house. I also like her size because I can reasonably afford a large cage and enough toys and food for her.
I also think budgies are adorable and I liked my time getting to know them when I worked at a pet store. If I was going to get other birds ever, I might consider getting some budgies.
Just judging by pictures and videos, I appreciate many of the less common (for my area) Australian birds, like king parrots, princess parrots, and rosellas. I think they're pretty, but I haven't done much research on their temperaments and I've never met any in person.
I like looking at the big birds, but I don't think I'd ever be a good fit for one.