Windows 10/11 - Shared mode vs. Accounts

Hello there

Can someone explain the technical difference between:

- Shared device mode (Manage multi-user and guest Windows devices - Configure Windows | Microsoft Learn)

- Multiuser setting (Accounts - Family & Other users)

For my scenario I need to configure devices for shared use. The devices won't be managed with Intune.

The users will have a M365 account. What do you recommend?