Here it is, the year 2022, and Tabular is still lagging behind Multi-dimensional.
For complex, really well designed dimension, fact (measure) structures, Multi-dimensional is still superior. Sure, quick and dirty stuff may be faster in Tabular, but once they (business) start to add requests, you'll be looking for DAX commands that are already present in Multi-dimensional. And if you have a well designed Multi-dimensional model, it will be faster.
Chris Webb, a Microsoft staffer for Analysis Services posted a query on what is preventing users from switching to Tabular.
if you are looking for true comparison, read his blog:
The more you are prepared, the less you need it.