Benefits over sentry?
With errorship, all these are made available in one place; in your datadog account.
You also do not need to maintain two services. If you are already using datadog(maybe their APM and their logging and metrics service) then you might as well use them for error tracking instead of maintaining an additional account with sentry.
However, it is not a must that you give up sentry to use errorship. errorship will work just as fine, if you choose to continue with sentry.
Sentry lets you send exceptions to Datadog though?