I mean, Telegram is the worst of the bunch, but putting that aside, the point is that people aren't comparing telegram and whatsapp, they're comparing telegram, whatsapp, signal, matrix, sms, imessage, facebook messenger, instagram messenger, session, wire, wechat, the crypto ones, kik, and a dozen other chat clients you've never heard of. And most people are not actually making those comparisons, most people just use the one their friends use, or the one that their phone came with. Nobody, anywhere, is pretending there are only two options and picking one of them.