Let's do an apples to apples comparison
-End-to-end encrypted by default (WA yes, Telegram No)
-End-to-end encrypted group chats (WA yes, Telegram No)
-End-to-end encrypted group video calls (WA yes, Telegram No)
-End-to-end encrypted desktop chats (WA yes, Telegram No)
-Client-side encrypted cloud backups (WA yes, Telegram No)
-Cross-platform end-to-end encrypted chats (WA yes, Telegram No)
It's a bit hard to make a case for Telegram's good intentions when they lack the ability to actually deploy usable, ubiquitous end-to-end encryption. They could even pay people like Moxie to implement it for them, which begs the question, why haven't they. Durov absolutely has the money.
Yes WA and FB has access to your communications metadata, but so does Telegram. And every entity that hacks Telegram.
Pavel Durov isn't a magical entity of good will and intentions, he's a Russian guy with sure, decent eye towards good user experience, but the cost for that is too great, considering he's never hired a competent cryptographer to even see if the features the app provides could be implemented in a privacy preserving way. I'd love to be able to defend Telegram's design choices, but the more they spend their time adding "sleek animations" and other bs features, the clearer it becomes it's just another social media platform with same privacy features as Facebook Messenger:
-Not end-to-end encrypted by default (Telegram Yes, FBM yes)
-No end-to-end encrypted group chats (Telegram Yes, FBM yes)
-Opt-in 1:1 end-to-end encrypted chats on mobile (Telegram Yes, FBM yes)
In that comparison, WA comes at the top. But then again, it's a false dichotomy as Signal puts incremental privacy features with no real down-sides.
-Open source clients (Signal yes, WA no)
-Reproducible builds (Signal yes, WA no)
-User-managed groups (Signal yes, WA no)
(And no, Telegram being open source with reproducible builds isn't really worth anything until the verification confirms that it's really using proper E2EE. Currently Telegram's source only confirms that it's not E2EE by default etc.)
As for the surveillance capitalistic aspect, Telegram is only as good as their word. FB wasn't surveillance capitalistic when it started back in 2005. Telegram isn't slaughtering the piglet before it's time to cash in, but they can get hacked at any point, and the hundreds of billions of messages that sit on their server, effectively unencrypted (storing the database key in server's memory is the same as "not encrypted"), Telegram isn't private even if Durov never wanted to use that data. The fact is experts agree such data is a liability, a toxic asset, that nobody can protect forever. Durov isn't as security researcher patching zero-days faster than NSA, GCHQ, Fancy Bear, Unit8200, CCA et. al. find them. Most probably Durov wouldn't even realize a rootkit has been sneaking data out of his server for the past 8 years.
Compared to these risks, WA has been ahead of Telegram ever since they implemented Signal protocol in 2016.