Here are some points that show that how telegram is better than Whatsapp:
1. Extensive server storage
Telegram provides extensive storage. All your images, messages, media files, and documents will be stored on the cloud. Log out of any device and log back in at any time. You don't have to worry about data backup or restoration. You can see the current sessions and which devices you are logged into now.
You can also download any file from any location at any time. By popping over here, you can also find where is telegram files stored. Uploading a single file with a maximum size of 2GB is possible as of today. There is no limit to the number of files that can be uploaded.
2. Media compression
The user can choose to send the uncompressed image or compress it. You can send a raw Jpeg image as either raw or compressed. You can choose to send the image without compression if you wish to keep the original quality.
3. Capacity to have a group member
A telegram group can only have a maximum of 200k members as of today. WhatsApp has 256 members as its maximum group capacity.
4. Username feature
Telegram allows you to communicate with anyone even if they don't have your contact number. This protects the contact number of the user. It is possible to continue sending messages to a group of people without sharing your phone number.
Channels are somewhat like groups. They can hold unlimited members. The channel creator can control who can post, and which members can see the posts.