Main difference: turn (Koi -1 vs Deputy -1.5). The Deputy turns over more easily (better for less power or turnover shots); the Koi resists turn and holds a hyzer.
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FAQ
Is the Koi or Deputy more overstable?
The Koi is more overstable (stability -1 vs -1.5). It resists turning and fades harder.
Should a beginner pick the Koi or Deputy?
A beginner is better off with the Deputy (beginner score 68/100 vs 65/100) - lower speed and more turn make it easier to control.
What is the difference between the Koi and Deputy?
Main difference: turn (Koi -1 vs Deputy -1.5). The Deputy turns over more easily (better for less power or turnover shots); the Koi resists turn and holds a hyzer.