Telegram is cross-platform
Although WhatsApp is officially available on Android and iOS, it can also be used on the Web browser. However, Telegram offers more. Telegram is truly cross-platform.
The first benefit of Telegram is that it is not only available for Android and iOS but also covers Linux, Windows, macOS desktops, including Windows smartphones. It doesn't matter what platform you use, Telegram will always connect you to your loved ones. You can also find various attractive stickers on telegram.
Image Source: Google
Telegram is cloud-based. The client-side code for Telegram's app is open-source, but the server-side source remains closed. It is true that the API provided by Telegram will not be very helpful for developers. Instead, it will allow users to create an app using the same Telegram servers and accounts.
The second thing is that if you create a messaging client app with Telegram open-source code, you must publish the source code on Github.
Although it doesn't sound like much, open-source is a good option if you want to make something better for your friends or yourself. You will need to register here if you wish to create your own Telegram client app.
Telegram Cloud-based messages
My favorite feature of Telegram is it's cloud-based messaging. This gives Telegram an advantage over Whatsapp. What happens is that all media files and data on other messaging apps are stored locally on your phone, whether it's an image, video, or music.
This eventually eats up all of your storage space. Telegram is different. All media files, including chat, are stored on Telegram's secure cloud servers. They will remain there until you decide to manually download them to reduce your storage space.