There are a lot of good reasons to use Azure Cosmos DB, as it offers a uniquely ‘single pane of glass’ over the increasingly ‘polyglot persistence’ world of enterprise data. One of the innovative ways in which it does this is with the tunable consistency feature for persisting data (see here for the documented 5 levels of consistency).
https://blogs.technet.microsoft.com/uktechnet/2018/03/20/azure-cosmos-db-tunable-consistency/