I’m not sure what you’re asking, @manuelalonso. You say you’ve heard that iCloud and Sync working together tend to cause conflicts, since both compete against each other. You’re asking for a developer to weigh in with a final answer. What is confusing me is that you’ve asked the same question before, were directed to the relevant help section, which was written by the developers, and then acknowledged the information.
Is this a different question than the other? If so, how so? It helps to be as specific as possible, otherwise your request may inadvertently go unanswered.