When comparing Spring-boot vs CakePHP, the Slant community recommends Spring-boot for most people. In the question“What are the best backend web frameworks?” Spring-boot is ranked 8th while CakePHP is ranked 49th. The most important reason people chose Spring-boot is:
Boot is just a thin configuration layer over Spring Framework, as such it inherits all the strengths of Spring.
Specs
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Pros

Pro Inherits all of Spring's strengths
Boot is just a thin configuration layer over Spring Framework, as such it inherits all the strengths of Spring.

Pro Preconfigured starters

Pro Fast prototyping
Spring boot is built for fast prototyping.

Pro Kick down to Spring
Pro Built-in ORM that's easy to use
Cake has a built-in ORM which is pretty easy to use and learn. Building queries can also be done very easily and fetching entire columns can be done in one or two lines of code.
Pro Fast development
Developing in CakePHP is very fast and flexible.
CakePHP is about fast and reliable development, it achieves this by following the convention over configuration principle as it's heavily inspired by Rails (which follows the same programming paradigm).
Convention over configuration is all about making it easier for the developer to start immediately writing code without worrying on what's going on "under the hood".
Pro Large library of helper classes
CakePHP has a large library of helper classes with features such as:
- Authorization
- AJAX
- Forms
- E-mails
- Internationalization
etc...
Pro Exhaustive list of resources to learn CakePHP
Cake's great community has thrown together an exhaustive and amazing list of resources to get started with CakePHP. It's open source and can be found on GitHub.
Pro Open Source
CakePHP open source and is licensed under the MIT license.
Cons
Con Lacking in UI development
While actually very good and with a very complete and rich feature set to develop and maintain code on the server side, it still doesn't provide any rich framework for building good user interfaces.
Con Slow
Because of legacy code, old concepts and prioritizing development speed over everything else, CakePHP is bloated and slow.
