The Hornet is the next step down from the Buzz.
The Straight Flush is for the driest of lane conditons that will still allow a resin ball to clear the heads; it is a limited use ball, a tournament special condition ball. It is a pancake core ball.
The Hornet is a stronger (than the SF) ball and more generic for light to medium-light oil, a goto ball for when the Buzz is either hooking too much or cannot clear the midlane properly.
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"None are so blind as those who will not see."