A one-time download creates a file for the selected year range and content types. It is useful for imports, archive snapshots and tools where you want full control over when data changes. Use the canton feed for personal calendars; business snapshots stay in data export.
A calendar subscription keeps a stable feed URL in the calendar app. It is better for personal calendars because future years and source-data updates can appear without downloading a new file manually. Choose a canton before adding cantonal holidays or school breaks to the feed.
Business exports remain separate: use the data export when CSV profiles, delimiters, language or HR-oriented import formats matter. Use the canton feed for personal calendars; business snapshots stay in data export.