When comparing Nagare vs Falcon, the Slant community recommends Falcon for most people. In the question“What are the best general-purpose Python web frameworks usable in production sites?” Falcon is ranked 8th while Nagare is ranked 14th. The most important reason people chose Falcon is:
Falcon is designed entirely around building REST APIs. It achieves this helps a lot with it being lightweight and simple. It also helps developers take some design choices which would otherwise not be possible with a more general-purpose framework,
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Continuation based web framework
Nagare allows for simpler programming flow hiding client/server requests.
Pro 100% Python web application development - no HTML, CSS or JS needed
Nagare is a mature web framework that saves you from manually creating routes. It basically is just a Python object graph.
Pro Built to build REST APIs
Falcon is designed entirely around building REST APIs. It achieves this helps a lot with it being lightweight and simple. It also helps developers take some design choices which would otherwise not be possible with a more general-purpose framework,
Pro Lightweight with minimal dependencies
Falcon is a very lightweight framework. This can be noticed simply by looking at the dependency list: other than the python standard library, six and mimeparse are the only dependencies.
Pro Performance is really awesome
Cons
Con Stateful server that maintains both session and UI states server side
Con Uses old YUI2 JS framework
Nagare uses YUI2 internally for XHR requests. YUI2 has been deprecated since 2011.
Con Limited in scope
Being designed around building REST APIs and the fact that it's minimalistic with very few dependencies makes Falcon opinionated (you should build a REST API) and limited in scope (you shouldn't be using Falcon to build a news site, blog or ecommerce platform).