In my opinion both 1) and 2) have similar purpose. Am I right?
1)Data Blending in Tableau desktop : We are basically bringing the 2 data sources at same granularity and then merging them together at a particular level
2) Flow in tableau prep: We can use the aggregation step on 2 data sets to bring them to same granularity and then join them.
Well, Both Statements are TRUE.