The Harpy, Steller's and Philippine Eagles are indeed impressive but being the Largest depends on what Dimension you are measuring!
Harpy eagle is heavier than the Philippine Eagle but the Harpy CANNOT claim the title of being the largest by that alone because the Steller's Sea Eagle is the HEAVIEST OF ALL EAGLE!
The Steller's has the longest wingspan of the three but it can't claim the title of being the largest by that alone because eagles like the Golden and the Wedge-tailed also has similar long wings due to the adaptation in open areas unlike the Harpy and Philippine Eagle which prefers the forests. BUT the Philippine Eagle has the LARGEST WING SURFACE AREA of all eagle.
The Steller's Sea eagle can't be the largest because should you measure its other dimensions it falls short compared to the Philippine Eagle as it holds the record of being the Longest and the Tallest among all three.
Lastly, Although the harpy has the largest Talons, the Philippine Eagle has the largest Tarsus among Eagles both are obviously stronger than the Steller's basing on their preferred prey.
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