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Redis vs MongoDB with oplog

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When comparing Redis vs MongoDB with oplog, the Slant community recommends Redis for most people. In the question“What are the best databases to push updates from the server database to the client in real time?” Redis is ranked 2nd while MongoDB with oplog is ranked 7th.

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Common Questions

What are the best databases to push updates from the server database to the client in real time?

Pros

Pro
Redis is written in ANSI C and therefore doesn't have a VM

Pro
Good support

Redis has great docs, an active mailing list, and a github community.

Pro
Redis uses the BSD license

This means that it is able to be used in a commercial product if one wants.

Pro
There are numerous client libraries and frameworks to make redis more powerful

For Node.JS for example you can get something similar to what Parse.com was offering by using Node ORM.

Pro
Great speed

MongoDB queries can be very fast because the data is usually all in one place and can easily be retrieved in a single lookup. But this is true only when the data is truly a document. When it's trying to emulate a relational model it starts to become really slow because it may have to perform many independent queries to retrieve a single document.

Pro
Easy to scale

MongoDB has powerful sharding and scaling capabilities for when the data stored in the database gets so large that a single machine may not be able to store all of it. Sharding solves this problem through horizontal scaling. Mongo gives developers the ability to easily and painlessly add or remove as many machines as needed.