Difference between Telegram and WhatsApp-

i.) In telegram we can do public or private chats which are end-to-end encrypted and Whatsapp chats were also end-to-end encrypted but now our phone's information and chat will go to Whatsapp according to their new update which is not a good thing.
ii.) In Whatsapp we can send up to only 100 MB file but in telegram, we can send up to 2 GB file which is more good than Whatsapp.
iii.) In Whatsapp our videos and images get compressed which means their quality gets down but in telegram, we can send compressed and non-compressed videos and images which is a very good thing. 
iv.) We can put status in Whatsapp but unfortunately not in telegram.
v.) Like this there are more differences between Whatsapp and telegram.  

Information about the signal app-

i.) A very famous person 'Elon Musk' tweeted "Use signal."
ii.) Signal is the same as Whatsapp which is end-to-end encrypted so we can put status, chat, and many more.
iii.) It does not take your information like Whatsapp which is a big thing.

Fun Fact-

The fun fact is that 90% of people have agreed the agreement without reading it and I also come in those people. And who cares because at one time the same type of news came for Facebook and no one has deleted Facebook so who will delete Whatsapp, 90% of people will not delete Whatsapp. The thing we can only do is delete Whatsapp but if the government makes a privacy policy that no one can take other's information then it may be helpful for us.

For more information check out this video: https://youtu.be/bUohzK9S6Bk