Most of the changes are cosmetic between the two choices:
  1. The font is different between the two.
  2. Date, Time, and Location are shown as bold for Modern layout.
  3. Modern layouts include a register and event reminder notifications for open events.
  4. Classic has event reminders on the first page of the registration whereas Modern has event reminders on the last page (confirmation page).
  5. Description for the event is located below event details for modern.
  6. Some event location fields are located directly below the event name in the classic layout.
  7. Different backend code is used for some of the components which can change how customizations can be implemented.