A SIEM is a commitment that lasts years. Detection rules, dashboards, playbooks and analyst skills all build up around one query language and one data model, and moving later is expensive. The right choice depends less on feature checklists and more on where your logs live, how you want to pay for data, and where that data is allowed to be stored.
Pricing models decide more than features
Most SIEM cost surprises come from the pricing model rather than the list price. Ingest-based pricing charges per gigabyte per day, which punishes verbose sources and encourages teams to drop useful logs. Workload or compute-based pricing charges for search and analytics capacity instead. Asset or user-based pricing makes cost predictable but can hide limits on retention or data volume. Model your real log volumes for each option before comparing quotes.
The main platforms at a glance
| Platform | Known for | Watch for | Good fit |
|---|---|---|---|
| Microsoft Sentinel | Cloud-native SIEM and SOAR, KQL, many Microsoft data sources free to ingest, unified with the Defender portal | Ingestion costs for non-Microsoft sources; hosted only in Azure | Microsoft-centric organizations already on Azure |
| Splunk Enterprise Security | Very flexible SPL search, huge app ecosystem, cloud or on-premises, now part of Cisco | Cost at high volumes; needs skilled administrators | Large SOCs with complex, diverse data and mature engineering |
| Google Security Operations | Fast search over long retention, YARA-L detections, built-in Google and Mandiant threat intelligence | Smaller third-party ecosystem; cloud only | High-volume environments that want long hot retention |
| Elastic Security | Open detection rules, ES|QL, self-managed or cloud, resource-based pricing | You operate and tune the cluster if self-managed | Engineering-led teams and on-premises requirements |
| IBM QRadar SIEM | Long-established on-premises SIEM with mature correlation | QRadar SaaS moved to Palo Alto Networks in 2024; check the long-term roadmap | Existing QRadar estates planning their next step |
| Wazuh | Free and open source, agent-based, file integrity monitoring and compliance mapping | Scaling and support are your responsibility | Smaller teams, labs and cost-sensitive deployments |
Data residency in the Gulf and beyond
Security logs contain usernames, IP addresses, email subjects and sometimes customer data, so they fall under data protection law. Banks, government entities and critical infrastructure operators in Saudi Arabia, the UAE and Qatar often face rules that require certain data to stay in the country or in approved clouds. Confirm which regions each SaaS SIEM can run in, whether backups and support access leave the region, and whether an on-premises or local cloud option exists if the regulator requires it.
Running a fair evaluation
- Pick five to ten detection use cases that matter to you, such as impossible travel, privilege escalation in the cloud console, or mass file deletion.
- Onboard the same log sources into each shortlisted SIEM and measure how long parsing and normalization take.
- Write each detection in each query language. The effort required tells you a lot about daily life with the platform.
- Replay a realistic attack and time detection, investigation and the handoff into SOAR or ticketing.
- Price three years at your projected volume growth, including retention and any premium data tiers.
Keep detections portable
Whatever you choose, write detections in Sigma where possible and keep them in version control. Sigma rules convert into KQL, SPL, ES|QL and other query languages, which protects your investment if you migrate later and makes it easier to share detection logic with partners and ISACs.
How we would choose
Choose Sentinel if Microsoft is already your main platform. Choose Splunk if you have complex, diverse data and the budget and people to make the most of it. Choose Google Security Operations if long, fast retention at high volume is the priority. Choose Elastic or Wazuh when you need control, on-premises deployment or lower license cost and have the engineering capacity to run them. In every case, the quality of your data and detections will matter more than the logo on the console.
- SIEM
- Microsoft Sentinel
- Splunk
- Google SecOps
- Elastic
- QRadar
- Wazuh
- Tool comparison
