Datadog wins on scope. If you need APM and distributed tracing, log management, per-process, container or Kubernetes metrics, threshold alerts on any metric or hundreds of integrations, Hyperping has none of those and is not building toward them.
Hyperping collects host metrics: CPU per state including iowait, 1, 5 and 15-minute load averages, memory, filesystem usage per mount point, disk I/O per device and network bytes per interface. It pairs them with uptime checks, status pages and on-call. The full list is in metrics collected.
If your servers are what you watch and traces belong to another team, the smaller product costs about a quarter as much. If you are chasing a p99 across 40 services, stay on Datadog.