We’ve got hundreds of thousands of users and we want push notifications to all their devices, to certain groups of people. We’ve got about 5000 classes. Each user in a class has notification preferences, they can choose or opt from a specific notification type. Let us say we have 20 telling types. We are to use SNS and Firebase to get this done. As far as I am aware, Firebase and SNS don’t possess message and doing it is.
What is a better option concerning rate and endurance, to push to every device individually or to create a topic per group, per notification kind?
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截止时间：2019 年 3 月 11 日 16 时