Blood parrot cichlids are my favorite. I don't know if I can this because I've never owned one, but from what I've seen they're like having a dog in your aquarium lol. Also I'll be getting one in a few months!
Blood parrots, i have one and is very smart. He can follow my finger, jump out of the water to get food, swim through a hoop when i want him too. Mine isnt a true blood parrot as he doesnt have a deformed mouth, and is a more orange colour.
Leopard ctenopoma if I had to pick one.
My new electric blue acara are right up there with them though. And then my angelfish are so pretty and my brts is stunning and always on display...... wait, sorry, I could keep going with this, lol. It is really hard to pick just one favorite.