You got it...

eh.. Maybe headroom? Get the single.
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More headroom. It won't start to compress as fast as the dual.
However, at the volume where it would make a noticeable difference, you wouldn't be hearing anything for quite some time.

Go for the dual/single.
Triple is louder and a tad bit more gain
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Melodic Thrash Metal and winners of the Wacken Metal Battle Canada and 2nd Place Runner Ups for Wacken Metal Battle International