Should I get z97 pro or hero?

Solution
The PRO has the 5-way optimization and 12+ phases and has Sata express, the Hero has 8+2 phases and only M.2.
If you want more features for your cash, get the PRO.

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Distinguished
Both are very good boards so what matters is what you do with it.
Gaming, overclock focus: Hero
Digital design, rendering: Z97 PRO

You can still overclock and play games well with the PRO, or use rendering/design software with the Hero, but each has their focus in their builds.