tan888, your survey will of course be biased to koi.
however, I have two flowerhorns and a koi pond. I find my flowerhorns boring. All they do is swim against the glass, waiting for food, and if food doesn't come they go back to their space. Having a single flowerhorn in a 75 gallon tank, I find myself falling asleep just watching them. They don't even swim around unlike arowanas. I wish they weren't so territorial so I can add more fish with them. I'm thinking of getting rid of them and replace them with goldfish.
My koi pond on the other hand, I could stay there for hours just admiring them. I find them very elegant as they glide effortlessly through the water. The many varieties and colors are stimulating and ensure I never get bored.
And they won't try to bite off a chunk of your finger too!
hehehe owkies thanks :)