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Look at performance numbers:

http://thebuild.com/presentations/pg-as-nosql-pgday-fosdem-2...

Furthermore, consider that PG is pretty much an amazing RDBMS in addition to having a good document story.

If numbers are the deciding factor for anyone, have a look at TokuMX which I believe has much better performance and storage characteristics compared to plain Mongo.

http://www.tokutek.com/products/tokumx-for-mongodb/

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