OnBalanceVolume vs. Accumulation/Distribution, any others?

I was looking at the two definitions and then saw them on the chart and noticed that A/D went positive(accumulation) while the OBV was still negative(but up sloping). So what am I missing here? Is it just the subtle formula? Which one would you trust more? And are there any other indicators that give a good portrayal of what is going on in the markets?
 

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