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Depends on if you have thousands and thosuands of dollars to spend.

Me i trust VGChartz over the monthly totals because we never get the NPD adjustments.

So if your looking for a grand total number it's better to go with VGchartz, then some hap hazard adding up every month NPD has given projection... or when a company quotes NPD numbers or seemingly do as they usually use PR means to make said things look different from what they are.