By Mahesh Subramanian
From a technical standpoint both of these products use leading edge technology. While SF marketing cloud is completely cloud based, Sitecore does provide completely in-house option and a hybrid option where platform can be in-house but the MongoDB(No SQL database) on the cloud.
Now specifically on the issue of keeping the customer data/profile on the CMS, it is preferable to keep them separate as learnt from several of my past experiences. Some of the key advantages that we can get out of that were:
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