The Graphic below details the differences between Windows Storage Server 2016 Workgroup and Standard Edition.  If a user needs Hyper-V functionality the Standard edition should be used.  However, if you want to spin up virtual machines using a third party virtualization program such as Virtual Box, that may be done on the Workgroup edition.

Notice also that the Workgroup edition has several other limitations such as 1 CPU, 6 hard drives, 32GB of RAM, 50 users, and 250 simultaneous connections.