Xubuntu 16.04 LTS is my daily driver linux distribution. It will receive support from Ubuntu until April 2021. So there is 3 years of time left to enjoy constant kernel performance updates. My other favorite distro is ChaletOS 16.04, which is a similar build. Xubuntu only uses 1GB of memory and very little CPU. Some people are exploring using Android on the desktop. But this has proven a waste of time, since the applications and peripherals (hard drives, DVD, USB, monitors, sound cards, wi-fi devices,etc. ) are more extensive under linux. With so much of computing now based on the web browser, there is very little linux cannot perform perfectly. Most of the web's back-end servers already run linux because of their stability and lower cost. Xubuntu 16.04 already had the new upgraded Software Library. I added the Mint Aqua xl_cheese theme, MacOS Icons, and Plank dock. Xubuntu has not changed its desktop features in many years. Some people move the task bar to the bottom to have it look similar to Windows. Highly recommended.
You can download Xubuntu here:
https://xubuntu.org/download
You can get the Mint Aqua xl_cheese theme here:
https://www.xfce-look.org/p/1241737/
Mac related wallpapers are available here:
http://wallpaperswide.com/mac-desktop-wallpapers.html
