Main difference: turn (Rune 0 vs Inner Core -0.5). The Inner Core turns over more easily (better for less power or turnover shots); the Rune resists turn and holds a hyzer.
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FAQ
Is the Rune or Inner Core more overstable?
The Rune is more overstable (stability +0 vs -0.5). It resists turning and fades harder.
Should a beginner pick the Rune or Inner Core?
A beginner is better off with the Inner Core (beginner score 65/100 vs 63/100) - lower speed and more turn make it easier to control.
What is the difference between the Rune and Inner Core?
Main difference: turn (Rune 0 vs Inner Core -0.5). The Inner Core turns over more easily (better for less power or turnover shots); the Rune resists turn and holds a hyzer.