I have recently transitioned away from Windows to Linux (Mint Cinnamon). I have 3 desktop systems, I use Linux on 2 of them and kept 1 for Windows 10. I have never bought a PC - always designed and built my own.
The Mint Gui is significantly more pleasant to use than Windows - simple, elegant, no silly frills like libraries etc., or the huge MS bloatware. Software management and updates are so much easier in Linux.
So for all my daily tasks I use Linux, with Firefox as my browser. LibreOffice suite is excellent - something that I missed on Windows. I retired in early 2010 and always had access to MS office at work, but never had a copy on my home machines, and I didn't want to pay MS prices - ouch. So for the past few years I had been using Google Docs and Spreadsheets - not bad, but not instant, and with many missing features. LibreOffice solves all that - at no cost.
Photo management, editing and video editing, all have good packages on Linux. And Rsync and Grsync are superb for backups - never found a Windows equivalent. I use Banshee for the few thousand music files I actually own.
But - Gaming? Windows is still king although it is possible to run many Windows based games and other software on Linux using the WINE translation layer. This works very well and performs well for many Windows packages, and many games, but not all. I loaded World of Warcraft on a Linux machine and used Wine - it worked very well except that the best performance for WOW needs DirectX 12, and Wine does not support that. I had to downgrade all my graphics settings to get playable WOW - not good enough - since I have a high end graphics card that I run with Ultra settings, WOW on Wine was just not acceptable - so had to keep that machine with Windows 10 that I now only use for gaming.
Linux is immensely stable and its design means viruses and malware will have a hard time penetrating, although not impossible.
In the world of enterprise business Linux dominates overwhelmingly and it is likely that every super computer on the planet runs Linux. Linux was based on Unix and so was MAC OS. They both have very similar internals and file systems. Also, Android is really just a pretty Gui sitting on an underlying Linux kernel.
But, in the desktop field, MS has some 90% of the market, with MAC OS at 7% and Linux at 2%. It comes down to money - desktop Linux distros are free and community supported - just not enough financial incentives to attract developers. In the business world those versions of Linux are well funded. Desktop Linux is very much liked by a large dedicated community and will likely grow, but does need to have more Windows like packages ported before it can truly rival Windows Dominance. MS Windows continues to make huge gaffs with its support and updates that alienate many people, which could mean more people move to Linux - just need more people to spread the word.
Linux is a great platform and fun to use - just been truly dissatisfied with the increasing complexity of Windows for doing the simplest tasks.