What makes a good gaming board for you? Not a trick question. Best depends on features, like how much overclocking you want to do, audio, network, and in some situations, aesthetics and fancy doo-dads.
Both of those are great overclocking boards.
This, the Professional Fatal1ty http://www.asrock.com/mb/Intel/Fatal1ty%20Z170%20Professional%20Gaming%20i7/ is their top-of-the-line Gaming board.