[1] https://info.seibert-media.net/display/Atlassian/Comparison+...
However, how can you take as unbiased a comparison table that uses adjectives as "Incredibly fast loading times", "UNRIVALED", etc.?
I'd say, except for its security/encryption...
And, it is quite easy to verify that WhatsApp's encryption is doing what we think. A friend of mine managed to reverse engineer their protocol in 2012 in less than 24 hours, by himself. And there is quite a big chunk of the computer security market that would disagree with the claim that something has to be open source to be verifiably secure.
1. most of the features that whatsapp lack are features I find annoying in Telegram.
2. Whatsapp is encrypted by default, which Telegram is not. I don't think I have ever used a secret chat, despite having oven 50 people with whom I regularly talk to over Telegram.
The client being open source is somewhat of a stretch. They have released many new versions, yet the github repo hasn't been updated in 7 months.
Note that they're both listed in the table as having "End-to-end encrypted chats" (value: "medium"?!)