CouchDB or Mongo for very high update rates & volume?

I recently investigated into a number of NoSQL technologies including CouchDB and MongoDB. The feeling I got was that MongoDB is more geared towards performance than CouchDB, possibly at the expense of certain features. E.g.

MongoDB uses language specific drivers, CouchDB uses REST. MongoDB is "Update In Place" whereas CouchDB is MVCC . MongoDB stores data in memory-mapped files.

You don't say what platform you're running on, or what platform you can host your nosql solution in. You also don't specify if you want a straight distributed key-value store, or a NoSQL database, which would be MongoDB. The two things are not the same, although a NoSQL database can be used as a kv store, I suppose.

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