Dragons definitely, a lot of creative flexibility in them. They're reflections of many different cultures and their legends.
As for flight/realism, who cares? It's a fictional being. Dragons don't necessarily have to adhere to any rules. You can construct yours as small as an iguana, or as big as mountain. Wings? Don't even need em my boi, look at lung dragons.
Although Dinosaurs are amazing themselves, including the fact that they once existed. It's mind blowing. However the idea of a dragon is still more liberating.
