The problem I have with FF dev tools is that json responses are hideous, just one long string. Where Chrome's look like json with expandable fields.
In the network panel (in FF), I have a structured view on JSON data, and can expand nested objects and arrays (like here https://mdn.mozillademos.org/files/7421/nm-response-json.png). Same goes for JS objects, which is a thing that bugged me long time.