More about the 5 Best Frontend Error Monitoring Tools.
Datadog is incumbent Enterprise Observability tool with broad capabilities and a high price tag, while BugSnag is an upstart in that space with less capability and a lower price. Datadog will be more useful for DevOps teams at large companies, while BugSnag will be useful for organizations with limited infrastructure scope and budget. For a lower-cost alternative focused on small teams for frontend error tracking, 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.