When comparing Miso vs Snap, the Slant community recommends Snap for most people. In the question“What are the best Haskell web frameworks for building RESTful web services?” Snap is ranked 7th while Miso is ranked 12th. The most important reason people chose Snap is:
Snap provides "snaplets". These are self-contained modules of code that provide additional functionality without muddling the core library. Having these resources saves time when developing code.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Fast
Pro Easy
Pro Isomorphic
Pro Virtual DOM
Pro Type-sharing
Pro Type-safe routing
Pro Provides modules for changeable functionality
Snap provides "snaplets". These are self-contained modules of code that provide additional functionality without muddling the core library. Having these resources saves time when developing code.
Cons
Con Bloated
Requires nix, ghcjs, and a lot of other sources of significant technical debt to the project.
Con Outdated documentation
The comprehensive Snap documentation is currently outdated (last activity appears to have been 2013), though Snap itself is under active development. Note that this primarily affects tutorials and guides; the API documentation is generated automatically and remains current.