The Premium Account unlocks additional options, e.g. flying bigger missions and increasing the speed limit. Furthermore, you can save your mission configurations in the cloud and access them across multiple devices.
Please tell us more about your project here and we will get in touch with you with a quote for a package fitting your personal needs soon.
A DJI Account is not required for any the app’s functions. However, depending on your DJI drone’s firmware, a DJI Account may be necessary to unlock DJI’s no-fly-zones.