I think it's more of an issue that developers consider their options to be SQL or NoSQL when the option of using both often is a great choice. You can pick the

I think it's more of an issue that developers consider their options to be SQL or NoSQL when the option of using both often is a great choice. You can pick the best technology to solve individual aspects of the system. For example, the current system I'm working on uses Oracle and Mongo, the previous used SQL Server and Redis. The main theme is to use a relational database for the structured data that we need transactional support for, e.g. orders, then use a NoSQL data for unstructured data and caching.