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Eahc of PAMM or Zulutrade, they have their advantages and disadvantage. I do not say anything about what is the best of them. But I think that using zulutrade for trading means you choose signal providing by a provider. The provider trade and what does he trade will be copied into your pair trading. While, in PAMM you choose a manager for trading for you. In the PAMM you will get in accordance with the interval determined.