Whatsapp is just a very famous app but its not too good for chatting with others. other apps are much better.
whatsapp is just a simple app for chat there is nothing good more than voice chat or calling.other apps will give you much better option to make your chat more enjoyable. like they provide service of theme. you can change theme. they give you option of stickers. they give the facility of video calling.
whatsapp is only a famous app there is nothing new changes from the starting and still. now whatsapp under the Facebook so we can expect more than simplicity.