How to Choose SCOM License

Hi Team, We are planning to monitor around 50 VMs and 50 Physical servers and all are Windows servers OS. do i need to buy SCOM standard license or data center license ?
As far as i read in articles, the servers managed by SCOM should be licensed and we just need to choose between standard or data center. With the total count of my environment, i thought of going with standard but need some advise.