Main difference: turn (Hammer -1 vs Blowfly I 0). The Hammer turns over more easily (better for less power or turnover shots); the Blowfly I resists turn and holds a hyzer.
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FAQ
Is the Hammer or Blowfly I more overstable?
The Blowfly I is more overstable (stability +2 vs +1). It resists turning and fades harder.
Should a beginner pick the Hammer or Blowfly I?
A beginner is better off with the Hammer (beginner score 56/100 vs 51/100) - lower speed and more turn make it easier to control.
What is the difference between the Hammer and Blowfly I?
Main difference: turn (Hammer -1 vs Blowfly I 0). The Hammer turns over more easily (better for less power or turnover shots); the Blowfly I resists turn and holds a hyzer.