Despite the efficient design of a Power BI dataset as well as new and future features of Power BI Premium that support larger datasets and greater performance, many organizations may choose SSAS for its rich and mature corporate BI features, such as source control integration, programmability, and partitions. With the Azure Analysis Services Web Designer, a Power BI dataset (PBIX file) can be migrated to a new SSAS Tabular project and deployed to either an on-premises SSAS server or to an Azure Analysis Services server. Additionally, via tools such as the BISM Normalizer, specific components of a Power BI Desktop model can be added to an existing SSAS Tabular project to promote reusability and consistency.
"I think it's fair to say that we're the only vendor that can claim a strong presence in self-service business...