Both terms are easy to understand. However, when the context for permissions is set and users are told why a particular permission is being asked, users are able to build trust in the app and be sure of their choices. In the absence of context, users are left confused about the reason for various permissions.
When the application name is used while seeking permission, more number of users are able to differentiate between the two option 'सिर्फ *app name* इस्तेमाल करते समय' and 'सिर्फ़ इस बार'.