These are distinct in many ways. An event-scope analysis looks at a specific element (number of occurrences of an event relating to that element). Visit-scope analyses look at data over the course of a visit (usually aggregated over the visit).
For example, the Page views and Loads metrics in Data Query both relate to the same technical element, which is the number of page hits received.
However, the first has a visit scope, meaning it will provide you with the total number of page loads of any pages viewed during a visit where page P was viewed.
The second has an event scope, so you will only get the number of page loads for that specific page.
All metrics that are based on the Loads metric will thus have an event scope, whereas those that are based on Page views will have a visit scope.
- Loads / visits = Average number of times the item is loaded per visit
- Page views/ visits = Average number of page loads that occur during a visit
Events can be page loads, clicks, impressions, plays, ...