Traders' Roundtable

I plan on using Oanda to do some forex trading. I have noticed some discrepancies in their data/charts vs. the CSI data that I have tested with. This is probably a common issue with data? Say I tested and plan to trade a 50 day breakout. Would a person use and rely on the CSI data, or the broker data?

To the extent that misery loves company, I'll share that I am having the same issue, only with eSignal data. When I compare my downloaded eSignal data with the CSI data provided with BLOX, I notice discrepancies. I'm still trying to sort out the variance.