I’m a lifetime Pushover user. As far as I can tell, ntfy isn’t using official push notifications whereas Pushover does. Also, ntfy has issues on iOS. That’s why I’m still running all my notifications via Pushover.
I thought I replied to this earlier, but it seems like it didn't take.
Pushover seems nice, but doesn't seem to be self-hostable. It looks like there is a replacement service in the works called Overpush.
All I can say is that I don't own any Apple products and never even looked at that section of their documentation. The Android and web clients work flawlessly, except that the Android client doesn't support markdown.
While it may work great, nothing beats using the manufacturer’s push notification channels in terms of reliability and battery consumption. At least from my experience. And that’s why Pushover is still kicking around after so many years…
Ntfy, if setup correctly, uses a web socket connection, which reduces the battery usage. I don't think I ever had it setup without that, so I can't say how bad it is. But with it, it's not a drain for me on a Pixel 7.
I use Gotify I self host it and it uses an app on my Android, super easy to set up and use. I tie in Home Assistant and a few other setups with it and it runs great.
Con: User separation. A user can create "apps" (channels), and will receive messages posted there. Users will not receive messages posted to apps they didn't create. I haven't yet found a way to create shared apps, or allow multiple clients to receive notifications for a given message, and I don't want to share client logins.
Now, this thread is 3 years old, so I don't know if this is still the case, but this is a deal breaker for me. Several of the topic I have for ntfy are also subscribed by my wife, meaning we both get the notifications. I could just post the same message to two different topics, but that would be lame.