I would also have a look at Hasura GraphQLEngine. Have used it now for various projects and is extremely nice, especially with the superb subscriptions support and eventing for the odd requirement that cant be handled within Postgres

I'm using Graphile in deployment at the moment, and it works quite nicely. Granted, we have a limited amount of users thus far, so I don't really know how well it handles big loads, but it allowed us to get off the ground with a PoC _really_ quickly.