The fact that google hangout is well integrated for the google mail users and chrome users, makes me to prefer it.
I receive messages faster, easy to access and communicate with my colleagues at work, hangout makes working from home fun,chat on hangout are well organised and sorted in order, and also, it notify me when messages are sent,hangout offer the ability to create groups for friends or co workers,keeping track of people is made easy, we make video calls daily with clients and trainee , the screen sharing has been very helpful in training our real estate agent on digital marketing. i suggest for my organisation to use google product such as gmail, chrome and hangout, its a great community for easy communication, since they are all well integrated.
One other thing is that I can search for my conversations, in case i forget, the fact that messages cannot be deleted after it has been sent has being beneficial, for record keeping, thanks to google.
I observed that hangout is not keeping up with latest instant messaging features, that allows to send multimedia document easily, accessing, selecting and sending images while on conversation is not easy to access on gallery at ones,the video call functionality needs upgrade to allow more people to share video calls at ones, my organisation is out growing the hangout messaging platforms, we need to be able to send pdf files on hangout, but hangout still remain our choice because it keeps us integrated in the google community, since what cannot be sent through hangout could be sent via gmail.