When comparing Pyramid vs Tornado, the Slant community recommends Pyramid for most people. In the question“What are the best general-purpose Python web frameworks usable in production sites?” Pyramid is ranked 5th while Tornado is ranked 7th. The most important reason people chose Pyramid is:
Pyramid can be used for creating small applications quickly and easily, but it also powers up large enterprise-scale applications such as Dropbox.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Very flexible
Pyramid can be used for creating small applications quickly and easily, but it also powers up large enterprise-scale applications such as Dropbox.
Pro Persistence agnostic
Either NoSQL and SQL (including SQLAlchemy plugin).
Pro Comes with security included
Includes authorization and authentication with multiple backends.
Pro Designed for performance
Tornado can scale to several open connections at the same time. This makes it perfect for applications where performance is very important.
Pro Amazing asynchronous functionalities
Cons
Con The great number of options it offers can become intimidating
One of Pyramid's greatest drawbacks is that it requires a lot of set up in the beginning of a project. This can feel overwhelming and can keep people away from using it.
Con It's usually useful only when building real-time web applications
Because it's basically a framework for building real-time applications it has great support for things like WebScokets and uses non-blocking I/O. But it lacks in features that are used to build general-purpose websites like blogs, e-commerce sites, web portals etc...
For example it lacks ORM integration (at least out of the box) and it doesn't have a very powerful template engine.