Main difference: turn (Spark -0.5 vs Eagle -1). The Eagle turns over more easily (better for less power or turnover shots); the Spark resists turn and holds a hyzer.
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FAQ
Is the Spark or Eagle more overstable?
The Spark is more overstable (stability +2.5 vs +2). It resists turning and fades harder.
Should a beginner pick the Spark or Eagle?
A beginner is better off with the Eagle (beginner score 42/100 vs 39/100) - lower speed and more turn make it easier to control.
What is the difference between the Spark and Eagle?
Main difference: turn (Spark -0.5 vs Eagle -1). The Eagle turns over more easily (better for less power or turnover shots); the Spark resists turn and holds a hyzer.