Flash of Light costs a bit more than Disease Cloud and isn't quite as reliable. Shadowknights have pretty much guaranteed aggro for the entire fight for 10 mana. Paladins can't do that. For shadowknights, that 10 mana per kill is just enough, sometimes actually not enough, to sustain through the 1/tick standing regen. A paladin (without clarity/bardsong) cannot be more efficient in that way, it's guaranteed to be less. With a good group, the tank should never have time to sit down, and the shadowknight has a slight advantage in that department since his aggro costs a little less mana.
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