[brockers]

I have to second this. CouchDB has a much better native interface than Mongo (pure HTTP/REST JSON) and automatic syncying.

Honestly, most of the time I think the real problem is developers not being able to cognitively handle changing from a SQL style declarative syntax to a functional map/reduce style syntax. It takes higher-order thinking, but the results are dramatically better.

[Maro]

SQL is declarative. There's no sense in which functional is higher-order than declarative.

When you write map/reduce, you're doing a mix of functional and probably imperative down the line. Putting syntactic sugar aside, it's hard to beat SQL in tersity, because you're talking to a big query engine which can do JOIN/WHERE/GROUP BY/HAVING/etc.