If comparing stats, Monte Carlo.
If comparing perks, whichever you feel is better.
English
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Hardlight and Monte Carlo have the same stats (until factoring in the perks chosen). The stats on them are negligible when comparing them to each other.
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Out of the box, Monte Carlo has a slight edge on range. Hard Light has a slight edge in stability and reload, however I find MC to be more stable.
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Only fire rate and impact are the same, other stats are different