Telegram's UX is better for security. You know when you can expect difference levels of security, and the best that can be done is just as good if not better.
Fair comment. Still, at that point, you're trusting a third party just like in Telegram case. In any case, if anything, the default settings in WA are closer to an ideal E2EE than Telegram.
The default setting in whatsapp is to show a full screen prompt asking you to backup to google drive. 98% of users enable this, meaning it is worse than Telegram. You don't even know who has enabled it.
You don't trust WA nor Facebook regarding your data, which is what we were discussing. You do trust them regarding your metadata, and it's indeed a problem.