Better Stack is an observability suite. If you want traces, error tracking and session replays in the same place as your uptime checks, it does that and Hyperping does not.
Each responder license also comes with unlimited phone and SMS alerts, where Hyperping Pro includes 75 SMS credits a month. A team that pages by text all night will notice.
Logs are the closer call. Hyperping now takes them too, in alpha: 20 GB a month on Pro, then $0.25 per GB, against $0.10 per GB on Better Stack in the EU. Past a few hundred GB a month, its lower price per GB outweighs the responder licenses, so a team that sends terabytes of logs should stay.
If you bought the suite for the monitors, the status page and the rotation, you are paying for the half you never open.