OSX : Productivity, Linux : Development, Windows : Games
I've been with all of these for all my computing life & still doing the same.
OSX/macOS is great for anyone who doesn't want to meddle with their system, especially if you use iDevices. Though developers have historically liked OSX, it could be apt for web development or anything non resource consuming (like java/android). For e.g I symlinked my android sdk (15 GB) to another SSD and had the android studio run from the native partition & the android studio's instant run feature sure made whole lot of mess and took 1 hour to compile ~2,00,000 lines of code. Of course this is not the fault of OSX, but I can manage partitions better & expandability is cheaper in a linux based system. Of course
Linux : I use an external SSD with Arch Linux for android development with the Mac. It has improved my development productivity multifold. Of course you might need some tinkering to do, but will be straight forward unless it involves GPU. Basically GPU drivers, especially Nvidia sucks big time on linux.
Windows : DirectX.