I was just getting ready to post the same thing as Afagundes. Best to shoot according to the histogram (and even OVEREXPOSE if you shoot RAW) and adjust in post processing. The reason to overexpose is there is LESS detail in the darker shades and you cannot get those back! If you overexpose, even bumping your ISO to do so, you'll have less noise! Just use careful as you don't want to overexpose whites too much and loose all detail, but again, RAW helps a ton with that. Darker does make the colors look richer, but simply adjusting in PP (as with the curves, or other ways) can bring that out without the loss of detail or the added noise.
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