WeChat

Pros: It offers Intuitive design and features for communication. It has multi-platform support, which makes it easy to connect with mobile and desktop. It also offers a file-sharing option.

Cons: It worked great for me. Nothing to share about the con.

Overall: It's a very handy digital communication tool. It offers great video and instant messaging functionality to get connected with friends and colleagues. I highly recommend this too it's a great video calling app.

Pros: (+) Multi-application, mini-apps, and support to many features is a definite plus.
(+) Easy to use and very interactive interface.
(+) Integration with various other businesses.
(+) Easy to setup.

Cons: (-) Not as fast as regular communication applications.
(-) Privacy is not up to the mark.
(-) Improvements on the collaboration interface.

Overall: WeChat is easy to set up just like any other social media platform. It is free like any other communication application like WhatsApp, Viber, and Facebook. The most important feature which makes WeChat special is its ability to collaborate and set up for business. The calling options are also very good.

WeChat has rumors that the Chinese government can access the data. On the piracy note, WeChat is not up to the mark, I would definitely suggest the application for its features.

Pros: I use WeChat to communicate with classmates in some culture clubs at university. I prefer FB Messenger groups to WeChat groups though, because I find that WeChat makes my older Android phone laggy. It's pretty cool how WeChat had payment options and miniapps long before most western messaging apps though.

Cons: Makes phone laggy, is memory intensive, can make phone hot to the touch after ~10 min of calling someone via WeChat. Supposedly is monitored by the Chinese government.

Overall: Most used abroad in China. Basically like Line in Japan, or KakaoTalk in Korea. Mostly needed only if trying to communicate with large groups from those regions.