When comparing Yesod vs Phoenix, the Slant community recommends Phoenix for most people. In the question“What are the best backend web frameworks?” Phoenix is ranked 1st while Yesod is ranked 12th.
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 Very positive reviews
Pro Relatively big community
It has the biggest community from all Elixir web frameworks so there are examples and tutorials all over the place and you can quickly find help.
Pro Easy to learn
The official guides are really well written.
Pro Will be easy to learn for Rails developers
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.