I would say the arena lighting has the biggest impact on your photos, second being aperture of your lens. I used the Tamron 70-200 VC on the 7D, 6D and 7D Mark 2. To each their own advantages, but the 7d Mark2's Flicker setting is a game changer for crappy arena lighting. I could not comment on the Sigma 120-300 or Canon 70-200 but the Tamron certainly is the speediest of my lenses and depending where you set up can cover the net to middle of the arena. Good Luck!
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