In addition to what other's posted, CouchDB is one of the few NoSQL solutions that will give you master-master replication. Mongo and Rethink are both single-m

In addition to what other's posted, CouchDB is one of the few NoSQL solutions that will give you master-master replication. Mongo and Rethink are both single-master/multi-slave solutions. One is not better than the other, just depends what you need. And as someone else mentioned, if you want complexity out of your CouchDB queries, you must write map-reduce functions to provide those "views" for you to query. Rethink you can treat similar to a SQL data store and just execute queries against it.