You forgot Windows 10 IoT. Actually, maybe you didn't. I tried it and unless you're really tied to an application it's not really ready and probably never will be.
Seriously though - it will depend on what you're doing with the Pi.
NOOBS is not an O/S, but a package of other O/S like Raspbian Arch etc. If you have a big SD card up to 32 GB, NOOBS allows 2-3 choices at boot time of say OpenELEC and Rasbian for example...
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