When comparing Fiber vs Iris, the Slant community recommends Fiber for most people. In the question“What are the best web frameworks for Go?” Fiber is ranked 5th while Iris is ranked 13th. The most important reason people chose Fiber is:
Fiber uses fasthttp what make it really fast.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Faster than most of other frameworks
Fiber uses fasthttp what make it really fast.
Pro Simple for JavaScript developers
Pro Healthy repo
Pro Rich middleware
Pro Uses go module's
Pro Express inspired short learing curve
Pro Testable
Pro No need to find and install external libraries
Iris is a "batteries included" web framework, which means that a lot of features already come out of the box. This way you don't have to spend time and find third-party libraries to integrate to the framework for most of the tasks you need to complete.
Pro Efficiency
Efficiency by using a light engine.
Pro Development
Pro API
If you're familiar with expressjs or other modern web frameworks, Iris will make you feel at home.
Pro More than feature complete
Pro More than 250 examples
More than 250 examples for implementing web application.
Pro Low amount of bugs
Most issues are questions, few bug reports and if a bug is found it's quickly patched.
Pro Good for big projects
Iris is a good framework for big projects and the author helps solving problems.
Cons
Con No support for http2
Con Previously experience with net/http
Previously experience with the Go's standard net/http package is necessary for you to move forward with Iris.