Whether it's a Standalone Voucher or a Directory Voucher (voucher that you can assign to a Voucher Directory), you always have the option to select any of the Default Voucher Layouts, which are the Deals and the Events layouts.
For Standalone Vouchers, you can select them in Step 5 of the campaign setup wizard:
For Directory Vouchers, you need to edit them in the individual Vouchers' setup wizard by going to Voucher > Voucher List.
Or when editing the Voucher Directory Campaign, you can find individual edit buttons for each Offer in Step 5.
Now the difference between the Deals and Events Voucher Template is only with their layout.
Here's how the Deals Template is laid out:
Note:
In the Deals Template, the Voucher's Primary Image (Select Image) is not used.
Events Template:
While these are the default templates for Vouchers, the templates are not limited to only the Deals and Events options. You can create your own desired template if desired. You can go to Vouchers > Voucher Layouts to create your own layout from scratch.
You will need to do some testing first to see how the template will look.