When comparing Skype vs Linphone, the Slant community recommends Linphone for most people. In the question“What are the best VoIP clients for Linux?” Linphone is ranked 5th while Skype is ranked 10th. The most important reason people chose Linphone is:
Free and Open Source.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easily connect with others due to how popular the service is
There's a good chance that whoever you're trying to reach has Skype already set up and familiar with it, avoiding the hassle of installing and getting to know new software.
Pro Screen sharing
You can show your whole desktop, a select part of the screen or a specific window over Skype.
Pro Cross-platform
There's software for Windows, Mac & Linux and apps are available on iPhone, Android, and Windows Phone.
Pro Group video for free
You can hold video calls with up to 10 people.
Pro Available on Linux
A stripped down, minimalist version of Skype is available for Linux.
Pro File sharing
Skype allows you to send any files (MP3s, images, text, etc.) by simply dragging and dropping then in the chat window making it simple to share things with colleagues.
Pro Cheap fixed phone number
Starting at $5/mo you can get a Skype number.
Pro Send SMS and make regular calls
With Skype Credit bought or a subscription, you can send SMS and make direct calls.
Pro Group chat with archive / records
Pro Powerful 1:1 chat and also group chat
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 Plagued by bugs on all platforms
Crashes and other bugs are prevalent on Android, Windows and other platforms.
Con Subpar video quality with more than 5 users
Skype has significant problems with multiple users and video quality. Skype recommends that a max of 5 users group chat as video quality is severely affected. Even webcams tested with other chat services showed lower quality when used with Skype.
Con Not a feasible alternative as a professional team chat
Missing key feature such as centralized mgmt, centralized billing, data retention policies, ...
Con Poor quality when screensharing
It is not possible to manually set resolution or bitrate, and Skype often defaults to a resolution so low that text is unreadable. It is also not possible to transfer control over mouse and keyboard.
Con Slow filesharing speed
Con Owned by Microsoft
Con Obnoxiously large ads
Ads take up over 25% of the usable space.
Con Poor Linux support
The version available for linux users is quite outdated, and does not support some of the newer functionality, such as the free group video calling and screen sharing.
Con Requires both ends to be online (if neither end is using a cloud-enabled device)
Messages are sent and received only when both ends are online, if neither end is using a cloud-enabled device. In this case, if you are online 9-17 and your recipient is online 18-3, messages will never be delivered.
Con MIcrosoft (Skype's owner) actively assists eavesdroppers
On the other hand, if you lose your copy of one of your conversations, you may be able to get a copy of it from your government with a little bit of luck and a public records request.
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.