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These libraries are not comparable. The output of the simdjson parser is a read-only structure. In other words, it can't be changed, and the only way to create one is by parsing a JSON string. On the other hand, Boost.JSON allows you to modify the container holding the parsed JSON, or even build a JSON document from scratch through the container interface.
            The purpose of this library is to enable algorithms which implement JSON
            functionality in their public interfaces to be interoperable, by providing
            a value
            type that meets the bar for vocabulary type suitability. Parsing directly
            into a user defined type offers some advantages but is not the goal of
            the library. However, users who wish to parse directly into their own
            types may implement a custom handler for this purpose.
          
            Using standard allocators would require that value be declared as a class
            template, which would impose an additional compilation burden. By avoiding
            the template, most of the function definitions in the library can be
            excluded from the headers and emitted in a separate static or dynamic
            library.
          
storage_ptr over polymorphic_allocator? 
            polymorphic_allocator treats
            the memory resource as a reference with respect to ownership. Boost.JSON
            uses a reference counted smart pointer container to simplify the lifetime
            management of memory resources. In addition to being reference counted,
            storage_ptr
            can function as an uncounted reference wrapper around a memory_resource.
          
string instead of std::string?"
        
            The string provided by the library uses the storage_ptr allocator model,
            has the same interface on all C++ versions, and has an optimized class
            layout to keep the size of JSON values small. string also implements an improved
            interface that replaces extraneous overloads with ones that use string_view.