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Quality of data matters

The two charts seem similar for the untrained eye.
But there is a crucial difference for a cycle hunter.
Using data from Bitfinex would make the analyst throw away an hypothesis while Bitstamp would make one keep it.

Going over heaps of data, I know which to trust of these two: Bitstamp over Bitfinex any day.
Note
Coinbase is consistent with Bitstamp:
snapshot

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