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On Mongo: "we were not big fans of the master/slave architecture"

I don't quite understand this, that architecture was basically deprecated a while back, can you elaborate?

Sorry, I need to correct that. I meant that shards are basically still primary / secondary with an arbiter for failover. We prefer horizontal nodes instead, like Cloudant, Elastic Search or Cassandra offers.

Ahh, I see. Why do you guys prefer that configuration? Space/resources, reliability?

probably large amounts of writes.

Space/resources was certainly a concern in this case. A disk-based solution with predictable latencies enables storage of far more data than something that requires holding the working set in RAM.

Can you elaborate on what you mean by it was deprecated a while back?

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