Hello experts?

Our company need a Monitoring software. Please for discussion monitoring software difference.

Thanks

https://social.technet.microsoft.com/Forums/en-US/2c38f8c6-fcb2-4f7d-ba08-b2c68ee7d83c/scom-2012-vs-nagios-vs-ca-nimsoft-vs-hp-oprations-manager?forum=operationsmanagergeneral

https://social.technet.microsoft.com/Forums/en-US/7aab19d8-e654-4203-bba6-f50f10f2e91c/system-center-essentials-vs-nagios?forum=systemcenter

https://social.technet.microsoft.com/Forums/en-US/b69c7def-ce26-46f8-ab4b-1de46f43b3ee/comparision-between-microsoft-products-vs-manage-engine?forum=winserversecurity