Multidimensional and Tabular Compared
Microsoft's SSAS offers a choice of technology for OLAP cubes - the original Multidimensional, and the newer, Tabular. I compared them back in 2012 http://richardlees.blogspot.com.au/2012/05/sql-server-2012-tabular-versus.html. It is now safe to assume now that Tabular is the strategic technology. Not officially strategic, but with the dearth of Multidimensional enhancements since 2012 and Tabular recently becoming the default install, it is clear to see where Microsoft is heading.