This is a hypothetical creative debate
Horse-sized Duck: A duck that has grown to the size of an average horse. This creature has all the characteristics of a regular duck (like webbed feet, a bill, and feathers) but is significantly larger.
Duck-sized Horses: These are horses that have shrunk to the size of an average duck. They possess all the characteristics of a regular horse (like hooves and manes) but are significantly smaller.
The debate assumes that both scenarios are to happen. Defend your side evidencing which scenario is more manageable