What are the best blog engines in Rails?

There doesn't seem to be too much in the Rails world for blogging, but there are some available such as monologue, or ecrire

Is it viable to use a Rails engine, or better to go down the route of keeping the blog out of Rails (Ghost for example, or even WordPress)?

Suggest a resource

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Monologue - Rails mountable blog engine

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Monologue is a basic blogging engine. It is a Rails mountable engine you can mount in your already existing Rails app, or a in a new one! Enjoy.

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Ecrire - Ruby blog engine

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Ecrire is a blog engine built for web professionals. Most best practices comes builtin for you to quickly create powerful websites.