Somewhat unrelated to the actual package but I find that properly written/considered comparison (why X package instead of Y?) sections are a strong indicator of library/package quality, and this library passes that test:
To summarize, they're about equal in terms of performance but I'd argue my library wins on stability and maintainability as the minimal API enables a tiny codebase, which means less docs, less tests and most importantly, less bugs.
Furthermore, the future of gorilla/websocket is uncertain. https://github.com/gorilla/websocket/issues/370