The Scheduled Reports are more limited than those of the Quick Reports. It would be nice to either have the option to schedule a Quick Report, or to have all of the options that are listed for a Quick Report as a Scheduled Report.
For example, when using the Network Threat Protection/Top Targets Attacked report, the "Group by" options for Quick Reports can be more granular like Client, Port, Subnet. However for the same report, under the Scheduled Reports tab, I am not allowed to group them - it's only doing it by Group (OU). So, I will then have to run a Quick Report to get the information that I need (Client computer, Port or Subnet).