When comparing Aura Framework vs Lumen, the Slant community recommends Lumen for most people. In the question“What are the best PHP frameworks?” Lumen is ranked 17th while Aura Framework is ranked 21st. The most important reason people chose Lumen is:
Since it's basically just a minimal version of Laravel, it can be upgraded to a full Laravel app if the need arises. No need for code changes, just import the code to a new Laravel install.
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Pros
Pro High quality, well tested code
This framework has highly tested code. It is very reliable. In fact, most of its libraries have gone through scrutinizer-ci.com and they all score very high.
Pro Loosely coupling allows for lots of flexibility
Aura is a loosely coupled collection of independent libraries with no base classes. This allow for extreme flexibility in choosing what libraries are needed.
Pro Easily upgradable to Laravel
Since it's basically just a minimal version of Laravel, it can be upgraded to a full Laravel app if the need arises. No need for code changes, just import the code to a new Laravel install.
Pro Feature rich
Pro Highest performing PHP micro-Framework
Lumen is benchmarked at 100/rps (Requests Per Second) faster than Slim v3, which used to be considered the fastest and most performant micro-Framework to date with the ability to handle 1800/rps. (1900/rps vs 1800/rps respectively).
Pro Easy to use
Cons
Con LICENSE
Con Small community
Aura's community is still relatively small and it can be a little hard to find help or guides if you get stuck somewhere.
Con Built for smaller tasks like APIs
Con It's based off Laravel and inherits its shortcomings
Lumen inherits many shortcomings of Laravel, such as static proxy classes.
Con Made to work alongside Laravel
Lumen as a framework is at it's full potential when used alongside it's older brother. Lumen was created to be used for microservices alongside Laravel, which is used for more user-facing applications. If a project is already using another framework other than Laravel, it would be better to use another microframework for microservices instead of Lumen.