WhatsApp’s Chat Title Bar vs Telegram’s
The arrow looks quite congested with the group icon. The attachment button is only accessible at the very top and is hard(er) to reach on large phones.
The attachment menu is located by the input field (not pictured). The arrow and icons have enough personal space. (The circle is actually smaller.) Instead of listing the names of the members in the group below the title (which is useless in groups over 4–5), the amount is listed instead.
I discovered this by accident, as I had a Chromer bubble covering the top-left corner of my screen. My WhatsApp chat suddenly appeared to be so much nicer. They could get rid of the arrow if they wanted to. If Telegram did, you’d be able to swipe back to the main chats list.