The eleven tools above sort into four buying patterns. Pick the pattern first, then the vendor.
If your top constraint is deployment speed
Start with Netdata (#1) — one command, charts on install. Layer Prometheus or Grafana Cloud later if you need long-term retention with PromQL.
If your top constraint is enterprise APM depth
Start with Dynatrace (#5) for Davis AI, then Datadog (#2) for the breadth play, then AppDynamics (#9) if you’re already Cisco-aligned.
If your top constraint is everything-in-one-pane SaaS and budget isn’t a forcing function
Datadog (#2) is the safe default. Build the bill calculator yourself before signing — every metered dimension stacks.
If your top constraint is on-prem / data sovereignty
Netdata (#1) self-hosted is the fastest path to value. Prometheus + Grafana (#3) and Zabbix (#10) are the established alternatives.
The recurring pattern: a DevOps team’s best monitoring tool is the one that fits how the team operates, not the one with the most enterprise checkboxes. Pick by pricing-model fit and deployment speed; everything else is engineering taste.