When comparing Spring-boot vs CodeBehind, the Slant community recommends Spring-boot for most people. In the question“What are the best backend web frameworks?” Spring-boot is ranked 9th while CodeBehind is ranked 36th. 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
Ranked in these QuestionsQuestion Ranking
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 Modern
CodeBehind is a modern framework with revolutionary ideas.
Pro Code-Behind
Code-Behind pattern will be fully respected.
Pro Under .NET Core
Your project will still be under ASP.NET Core and you will benefit from all the benefits of .NET Core.
Pro Get output
You can call the output of the aspx page in another aspx page and modify its output.
Pro Modular
It is modular. Just copy the new project files, including dll and aspx, into the current active project.
Pro Simple
Developing with CodeBehind is very simple. You can use mvc pattern or model-view or controller-view or only view.
Pro Fast
The CodeBehind framework is faster than the default structure of cshtml pages in ASP.NET Core.
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.
