I've been using Sentry lately. I've used all of them over the years and they are roughly the same. They're going to give you insight into exceptions being thrown on your JavaScript apps. They also support other languages as well and server side issues. In my opinion the frontend JS app bug monitoring is the primary draw here as there already exists so many backend logging and monitoring tools. In fact, I think these tools are also lagging when it comes to the backend, but they are of course trying to expand their product offering and it makes sense to connect frontend with backend to see an entire request lifecycle. Many of the backend tooling and services actually went the other way around and are lacking for the frontend. No one really seems to have nailed it.

I like sentry lately because they have recently brought online performance monitoring. With that and their current solutions, it's a very powerful and easy to use tool to gain insight on not only bugs to be addressed but also bugs and performance over time - from release to release. So you can track how your releases are having an affect.

If you are already entrenched in one tool, I'm not sure if it's worth switching. It depends on if you had any historical data you wanted to keep and how much work it is to switch. These tools are generally rather effortless to set up. Getting the source maps to Sentry can be a bit of a pain, but once you're set there with a process you don't need to think about it again.