Main difference: turn (F1 0 vs Spark -0.5). The Spark turns over more easily (better for less power or turnover shots); the F1 resists turn and holds a hyzer.
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FAQ
Is the F1 or Spark more overstable?
The F1 is more overstable (stability +3 vs +2.5). It resists turning and fades harder.
Should a beginner pick the F1 or Spark?
A beginner is better off with the Spark (beginner score 39/100 vs 37/100) - lower speed and more turn make it easier to control.
What is the difference between the F1 and Spark?
Main difference: turn (F1 0 vs Spark -0.5). The Spark turns over more easily (better for less power or turnover shots); the F1 resists turn and holds a hyzer.