More about the 5 Best Frontend Error Monitoring Tools.
Both Raygun and DataDog are full featured observability platforms. DataDog has better reporting and platform capability, while Raygun has better tools for handling noisy errors. Both tools are quite expensive. For a cheaper, front-end error tracking alternative that has great reporting and noise management, consider TrackJS.
With TrackJS, the focus is on errors occurring on the browser. Filtering is second to none, and the quick views of trending errors are helpful in digging past the 3rd party script noise. It filters down to the core issues.