Which way is the correct way of bird evolution?
The flightless Tengu who abandoned flight for strength, health and endurance, or the Harpy who uses flight and agility for hit and run attacks?
The Tengu who adopted a tribe culture, or the Harpy who kept its bird nesting ways?
The Tengu who stubbornly hang on to whatever little territory they have, or the Harpy that flies anywhere and raid anyone they want?
My opinion is that Tengus fairs better, but they are not true birds anymore. Other than the looks Tengus are just like humans. They are birds in name only.