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I'm creating an application that will be hosted on amazon EC2 and a lot of the data that'll be saved is more document oriented (as well as saving tweets and such related to those documents).
Right now I'm at a crossroads... should I use simpleDB or couchDB? Whats the pros/cons of using either? Should I just try both for a month and decide then?
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SimpleDB is deprecated, more expensive than DDB, and kind of weird to use.
CouchDB is 39th and comes in as the fourth most popular document-oriented NoSQL database.
Unbound by the strict requirements of a relational database, Amazon SimpleDB is optimized to provide high availability and flexibility, with little or no administrative burden.
The most notable feature of CouchDB not supported by DynamoDB is the views (see here for a high-level description).
You may find the the article Amazon SimpleDB and CouchDB Compared to be useful.
I've also found that MongoDB gives excellent performance.
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Keep in mind that if your code lives in EC2, SimpleDB will be presumably hosted in the same data center that your code is, which would give SimpleDB a lower latency than CouchDB for requests from an EC2 server. Also, Amazon doesn't charge you bandwidth costs between EC2 and SimpleDB.
I would expect SimpleDB to be both faster and cheaper for code running in EC2, for those reasons.
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