Wazuh vs Splunk vs Elastic Security: An Honest Comparison

The comparison between open source and commercial SIEMs is one of the hottest debates in cybersecurity. I have used Wazuh, Splunk, and Elastic Security in real production environments, and my conclusion is that none is universally better than the others - the choice depends on context. But I can share what I have learned in the field.

Wazuh: the open source champion

Wazuh is the heart of Presidio, my XDR platform. I run it in production with Wazuh 4.14.3 and I know it deeply. Strengths: zero licensing costs regardless of log volume, lightweight multi-platform agent, native MITRE ATT&CK integration, FIM, vulnerability detection, and compliance checking modules included. Weaknesses: the initial learning curve is steep, the UI is functional but not elegant, and for very large environments (10k+ agents) you need serious tuning expertise on Elasticsearch/OpenSearch.

Splunk: the enterprise heavyweight

Splunk does everything, well. The SPL query language is powerful for complex queries, the app and add-on ecosystem is huge, enterprise support is first-class. But ingest-volume-based licensing is its Achilles heel: for an SME generating 50-100GB of logs per day, licenses can exceed 100k annually. I have seen it kill IT budgets of mid-size companies.

Elastic Security: the middle ground

Elastic Security (the SIEM version of Elastic Stack) is an interesting compromise. More mature than Wazuh as a product, less expensive than Splunk. The Basic license is free, but advanced security features (ML anomaly detection, case management) require the Platinum license. OOTB detection rules are good and the community is active.

My recommendation: for SMEs with limited budget and a competent technical team, Wazuh. For enterprises with budget and a dedicated SOC team, Splunk or Elastic Platinum. For those who want a compromise, Elastic Security with Gold license. But remember: the best SIEM is the one your team knows how to use. A well-configured Wazuh beats an underutilized Splunk every day of the week. If you are evaluating which SIEM to adopt, I am available for a conversation based on my direct experience with all three.