The 14" Sabian B8X Rock Hi Hats have more weight and power than the regular 14" model, able to cut through loud music without overplaying the instrument.
Sabian B8X Cymbals superior to B8 cymbals in every way, but they're priced at exactly the same level! For the same amount of money, you get cymbals with more hammering (including on the bell) and an adjusted profile. In non-geek speak, that means more complexity of sound and louder volume.