When comparing Google Hangouts vs Linphone, the Slant community recommends Google Hangouts for most people. In the question“What are the best Skype alternatives?” Google Hangouts is ranked 9th while Linphone is ranked 14th. The most important reason people chose Google Hangouts is:
Hangouts offers both an Android and iOS app so users can participate from nearly any mobile device in addition to his Desktop.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Mobile support
Hangouts offers both an Android and iOS app so users can participate from nearly any mobile device in addition to his Desktop.
Pro Screen sharing
Any user can share his screen (or only a specific desktop or window) while still continuing an audio conversation.
Pro Free group video support
Hangouts works with up to 10 participants using video out of the box or up to 15 if you are a business, government or school. It determines who is the primary speaker at any given time, and the camera view automatically switches to that user.
Pro Useful for businesses
Hangouts can scale to become a videoconferencing solution for an entire company, since the software can run on nearly all platforms. In fact, Google itself uses Hangouts as its meeting room video conference software.
Pro Easy to start using
Hangouts is integrated with Gmail & Google+, does not require you to download desktop software, and all chats can take place directly in your browser, significantly reducing the barrier to entry for a new user.
Pro Completely free
Google offers all features of Hangouts completely free. There are business, education and government solutions that increase the participant count to for video calls to 15 and offers support.
Pro Cross platform
Hangouts work on Android, iOS, Chrome OS, web and as a Chrome extension.
Pro Live broadcasting and instant recording
With Google+ “Hangouts on Air”, you can broadcast any hangout to an unlimited audience via your Goolge+ Profile or simply a generic YouTube link. Moreover, any Hangout on Air (public or private) is automatically saved as YouTube video that you can keep for private reference or use in any way that you would normally share a YouTube video. This allows you to record conversations without additional obtrusive software.
Pro Google Voice integration
Allows for a fixed phone number, receiving and making calls. Calling US or Canada is free.
Pro Integrates with Google Maps for sharing locations
When chatting with people while trying to plan a meet up, the share map button can be extremely useful.
Pro Android app does both sms and hangouts messaging
Pro FOSS
Free and Open Source.
Pro Work well with FritzBox router
Pro Great SIP support
Basically every SIP provider supported.
Pro Simplistic and clean UI
Over the years, its UI has changed and improved by a lot.
Cons
Con Poor video call quality
Only goes up to 720p30 + low bitrate.
Con Owned by Google
Con Lacking clients for older versions
Con High hardware usage
Con Not recommended for long sessions

Con Won't work on Windows 8-style UI
As Hangouts uses a browser plugin on the desktop and it doesn't work with Windows 8-style UI, it has to be used in desktop mode.
Con UI not very intuitive
Implementation of Contacts and missing calls are not very intuitive.
Splitted View (left Contacts, right Call-History) would be much better as current look&feel.
UI don't mind the "less clicks are better" philosophy. It looks a bit thrown together. Some Icons here, some there.. no navigation strategy are used (like known from webpages)
Con Limited to flatpack installs
Yet another container service to keep up with.
Con Doesn't ring on incoming calls
Even if the Audio-File exists and can be played in the Settings-Dialog, it doesn't ring for an incoming call. Worked some time ago, currently not.
Con No Plugins available to add external Address-Books for contacts
would be nice to be able to add NextCloud, GoogleContacts or other Cloud-Services, or just an local Address-Book (like Thunderbird)
Con Up-to-date version in 2020 can only be compiled from source
There is either an outdated version in Ubuntu repos, official flatpak install has been broken for over 6 months, so you're left with compiling from source.
