
Support for Microsoft Edge (legacy) ended on March 9, 2021 , it depends on your strategy. You could just use WSUS and deploy the new Microsoft Edge and it will import data from the Legacy Microsoft Edge and users could quickly continue using the new Microsoft Edge. The other option would be upgrade to 20H2 and then deploy the Microsoft Edge.
Deployment using WSUS is the recommended and easier one but you could also manually download the Microsoft Edge package and deploy it the way you are deploying other applications and you may get it from:
https://www.microsoft.com/en-us/edge/business/download
In term of features and functionalities they are the same but if you use older version, it won't support new features and bug fixes. However, in term of supporting Group Policy and other enterprise features both WSUS and the Standalone package (considering the same version) are the same.