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Telegram starts to look like a super app, echoing WeChat
(techcrunch.com)
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For whatsapp nothing is opensource
That's kind of an apples an oranges comparison, WhatsApp doesn't even try to present a facade of being open source. Telegram does, betting that the distinction between server and client code will go over most peoples heads, which it probably does to be honest.
There are two realistic alternatives with hundreds of millions of users. Whatsapp has a closed source client, Telegram has an open source one. The choice for me is easy.
That sounds like a false dichotomy and I'm not sure why you even think the number of users is relevant. Why not choose something fully open source?
Because there is no alternative that is on my friends phone.
That sounds like a solvable problem.