Cognos vs Tableau

[knip]

Hi All,
People who interacted with Tableau and cognos...Do you guys see any feature/requirement which can't be done on tableau but on cognos?

[cognostechie]

As I understand, Tableau is more into Visualizations but it does not behave well when dealing with significant amount of data so the operational reporting or reporting from a relational database becomes a problem. Visualizations are mostly done with cubes ( at least that's how it is supposed to be done though lot of companies do it with operational reporting too because their developers don't know how to make cubes and hence try to justify a DMR to be a better alternative than a cube )