When comparing Yesod vs Actix, the Slant community recommends Yesod for most people. In the question“What are the best backend web frameworks?” Yesod is ranked 12th while Actix is ranked 22nd. The most important reason people chose Yesod is:
While not required, Yesod offers templating through a Shakespearean family of languages to produce page code.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Offers templating for type-safe, well-formed content
While not required, Yesod offers templating through a Shakespearean family of languages to produce page code.
Pro Uses type-safe URLs
Ensures that data provided by the URL is type-safe. This means that data in the URL has a definitive type.
Pro Can be used without knowing much Haskell
While Yesod is written in Haskell, developers can achieve basic functionality without much investment in the language.
Pro Blazingly fast
Pro Feature-rich
Actix provides a lot of features out of box. WebSockets, HTTP/2, pipelining etc
Pro Type-safe
Forget about stringly typed objects, from request to response, everything has types
Pro Extensible
Easily create your own libraries that any Actix application can use
Cons
Con Is hard to customize
Learning how Yesod works internally is hard. It is a large framework with complicated components. Finding the appropriate code and understanding how it contributes to the framework is difficult, meaning developers will struggle.
Con Too much template haskell
You actually want to code in haskell and not some DSL with "magic" hidden under the bonnet.