We have hundreds of thousands of users and we need push notifications for specific groups of people, to all their devices. We have about 5000 groups. Each user of a group has notification preferences, he can choose to include or disable a specific type of notification. Let's say we have 20 types of notification. To do this we need to use SNS and Firebase. As far as I know, SNS and Firebase do not have message filtering, and doing it on the mobile device is not something I would do.
What would be the best option in terms of speed and durability to deploy each device individually or to create a topic by type of notification, by group?