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The concept is more of an admin-standard user settings. The admin set global preferences for all users while also the standard users will be able to set their individual preferences.

In summary, the admin will set a global preference for all user to follow (this will definitely be saved in server so it affects all), while the user can further customise some other local setting which can either be saved in server or local but local storage would be better.

If you can save it on the server, i think you're better off saving it there than in the local storage of the browser, for security reasons. Although i know even if the user changes the local storage you'll check it with the server settings, but i think you work to much for a problem that can be fixed when the server creates the html.