The ten tools above cluster into four buying patterns. Pick the pattern first, then the tool.
If your constraint is fewer systems to operate and spans on your own infrastructure
Start with Netdata (#1). Traces, metrics and logs arrive at one agent, and the Traces tab sits next to the nodes they ran on. Check that you can live without service maps and span-derived metrics.
If you want a focused open-source trace store
Jaeger (#2) for a self-contained backend and UI, Grafana Tempo (#3) if you already run Grafana and want object storage and TraceQL.
If APM features drive the decision
SigNoz (#4) for open source, Datadog (#6), Dynatrace (#7) or New Relic (#8) for commercial suites with service maps, span metrics and profiling. Elastic APM (#9) if you already run Elasticsearch.
If you need open-ended, high-cardinality trace analysis
Honeycomb (#5).
Whatever you choose, instrument with OpenTelemetry. It keeps the backend decision reversible, and an OpenTelemetry Collector can send the same spans to two tools while you compare them on real traffic.