Mongodb vs. Couch Db Select Performances

Question

I read many things about performance comparison between Couch Db and Mongo Db at insert capabilities. However at somewhere it says that Couch Db has a better read performance. Is there any performance comparison based on select capabilities of between that databases?

Answer 1

Don't trust benchmarks

Good Benchmarks Are Non-Trivial

So here you can see, that CouchDB has High Read performance and MongoDB has High Write performance. So you will have many read operations, use CouchDB.

Answer 2

In addition to @Sergey's links, make sure you also read http://jan.prima.de/plok/archives/175-Benchmarks-You-are-Doing-it-Wrong.html and http://jan.prima.de/plok/archives/176-Caveats-of-Evaluating-Databases.html

It is not that one is verbatim faster than the other. But either will pick a different set of trade-offs that will result in a certain performance for your use case. But that doesn't say they are doing the same and either is better or worse.