A security operation center without SIEM cannot be called intelligent. Because time-series information and event management systems input security data from different network segments together with analytic algorithms to make correlations. So the system functions as a mind-expanding detective unit that gathers information to prevent future criminal acts.
Top SIEM Solutions:
Splunk... https://itbutler.sa/blog/best-tools-and-technologies-for-modern-security-operations-centers/