The Spark's sound is very honky and muffled, as though you're wearing earmuffs. The microphone specifications look better on paper but it really produces no discernable differences from the Attack. The Attack on the other hand, is very musical, clear, nowhere near as fatiguing and is cheaper. Although Ozone's questionable quality control makes it hard to recommend either of these headsets, it's an easy choice for me to recommend the Attack.