They have the same clock/memory speeds so there is NO difference other than that ugly cooler on the iceQ, and the reference one may be loud.
I prefer sapphire due to an awesome warranty experience that was not their fault. And they are a close AMD partner with great quality.
Has higher clocks, boosts to 1GHz, custom cooler, and should over clock well. Id never really consider HIS. Don't know why exactly though lol