New web versions of the messenger are marked with letters "K" and "Z," and you can check out Version K here and Version Z here. According to the Telegram team, both versions work equally well on both desktops and mobile devices.
When asked why there are two versions of the web app, the messenger team replied that they believe in internal competition.
However, not all Telegram features are implemented in both web apps at the moment. For example, they do not yet support secret and voice chats, audio and video calls, media editor, and the option to use multiple accounts at the same time. The complete list of features that have not yet been implemented in the web versions of Telegram can be found here and here.
In addition, Telegram has released an app independent of Google Play in the form of an apk file, which will be updated more often than the app from Google Play and will have fewer restrictions. It can be installed from the telegram.org/android page, bypassing the app store.
Apparently, the application contains materials that are blocked in versions from Google Play and the App Store, in particular, pirated and adult content.