Neither Accordian nor GenPark offers a free trial.
The starting price of Accordian begins at $59/month, while pricing details for GenPark are unavailable.
GenPark offers several advantages, including Lightweight data-interchange format, Easy human readability, Easy machine parsing, Language independent, Familiar to C-family languages and many more functionalities.
The cons of GenPark may include a Limited data types support, Redundant data representation, No namespaces, No control over type. and Insecurity with embeddable code