Clones because there are more and the laser could easily go through Spartan armor .
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Their armor's shields are built just for that. Not to mention those lasers have slower travel time than bullets. The augmented Spartans could probably dodge every shot fired
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The Spartans armer is was built to survive lasers
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Spartan armor is meant to save them the intense heats of plasma and lasers. Clones are basic humans while Spartans and augmented up the ass
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Clones have augmentation. Just not very much
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Spartans always get hit by lasers and live