I guess, Signal is even better from security point of view over Telegram. But half a year ago they didn't had a desktop App. I do love the backend storage of message at Telegram, but that also gives high risks for other to be able to hack your messages. Telegram normal channels are not end-2end encrypted, only their special channels. But it increases the speed of all channels, since not like WhatsApp you need your computer to connect through the internet to your phone before being able to use desktop messaging.