> When talking about privacy these articles should at least mention Signal. I hope they will use their recent funding [2] to polish their apps and increase the speed of innovation.
I keep repeating this often, but Signal is not a user friendly platform for average users. It is good for ephemeral chats and conversations that one wouldn't care about later. Signal actively blocks chats from being backed up (and restored) on iOS. So if you switch to a new device, you'd have to start afresh without any chat histories and also join all the groups once again. The fact that this issue was opened a long time ago on GitHub and responded to by saying it's a security issue to allow backups shows what audience Signal is focusing on (investigative journalists, dissidents and activists who use burner devices and don't need any traces of chats to linger around).
Telegram, on the other hand (even with the not-end-to-end-encrypted default), makes for easy moves between devices (supporting chat syncing across OSes and devices) and to newer devices, with every chat showing information shared as links, photos, etc., and very easy to get back to. Of course, since the chats are not stored encrypted on its servers, search is also blazingly fast.
One deficiency with Telegram is that the end-to-end encrypted chats ("secret chats") are tied to phones and can't be initiated from other devices or seen from other devices. Those also don't carry over to a new device. There is no technical reason for this, because Wire (which in my opinion is a better alternative to Signal and easier to sell others on) handles end-to-end encryption with syncing across devices.