When comparing Scotty vs Yesod, the Slant community recommends Yesod for most people. In the question“What are the best Haskell web frameworks for building RESTful web services?” Yesod is ranked 1st while Scotty is ranked 5th. 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
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Pros
Pro Easy to pick up and use
A simple framework cuts development time and costs. To get started, developers only need to understand how to write routing and actions.
Pro Available on gitHub
Having the source code on gitHub means developers can easily suggest improvements and error reports. They also have a community that can help with any problems that come up.
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.
Cons
Con Lacks features due to its small size
Since Scotty is small, it does not contain some features that a complex web application may need. Anything that Scotty can't provide must be either found or written, costing developers.
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.