How about 16x wide tent? That should be better than either (though with a HUGE performance hit). Between the two you're looking at, 8x edge detect should be slightly better, but both should be good enough so that there is little noticeable difference.
------------------------------Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
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