Is there a notable difference between Firefox Enterprise and standard Firefox with group policy management[0]?
[0]: https://support.mozilla.org/en-US/kb/customizing-firefox-usi...
Additional features and the option to deploy all supporting services on prem.
From compliance checklist point of view, there may be enough difference. Addressing it is the point.
Sounds like there's additional governance options (notably, SIEM integration) and Enterprise SSO - but I suspect the main benefit from the enterprise pov is going to be the account management and support teams.