We maintain an Ember app that uses JSON API, as well as a graphQL schema that both touch the same data. JSON API is well suited to Ember, since it manages data

We maintain an Ember app that uses JSON API, as well as a graphQL schema that both touch the same data. JSON API is well suited to Ember, since it manages data relationships client-side with its heavy data layer. GraphQL makes the backend a bit more complex (but not overly so IMO), but the tradeoff is that it abstracts the backend better than JSON API and allows new clients to be spun up more quickly since the data aspect is already taken care of, and the clients only need to be a view layer.