Broker Data Comparison (which allow cTrader copy function)

Hi, as per title, have anyone been tracking/observing which broker have the most stable price movement among all or with the sorting list from good to bad ? I have been using Pepperstone their data is awesome which totally none spiky movement at all, but unfortunately they don't allow cTrader copy feature, I am trying to be a strategy provider, downloading tons of data is actually quite slow.

So I created this post to allow anyone who know or been running tests to discuss which broker that allow cTrader copy have the best data around?