When comparing Flight vs Leaf, the Slant community recommends Leaf for most people. In the question“What are the best PHP frameworks?” Leaf is ranked 13th while Flight is ranked 16th. The most important reason people chose Leaf is:
Leaf has a simple structure and easy code.
Specs
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Pros
Pro Uses static methods
Since Flight uses static methods, it does not require for the application class to be instantiated.
Pro Open source
Flight is open source and is released under the MIT license.
Pro Filters
A unique feature of Flight is something that the author calls filters. Filters are functions which can be executed before and after any other function and can change the parameters and the output of said function.
This feature is used instead of hooks which in other frameworks are used to execute code into different parts of the application's life-cycle.
Pro Simple structure
Leaf has a simple structure and easy code.
Pro Useful classes
Contains classes for managing requests, responses, cookies, logging, views, HTTP caching, and more.
Pro Beautiful, well organised documentation
Pro REST-based
Cons
Con Cannot use ArrayAccess
The fact that it uses static methods means that it's impossible for Flight to make use of ArrayAccess, which in turns means that it cannot inject dependencies easily.
Con Lack of a database layer
Has inbuilt connection methods for only mysqli and pdo.