I love Ubuntu. But I installed it on my MacBook and still had plenty of trouble with it. External monitor support is meh, plugging/unplugging them too quickly will cause issues. Plugging into a 1080p monitor alongside my MBP's retina monitor causes issues because I can't seem to run different DPI scaling factors on different monitors at the same time. Suspend didn't work at all at first, and didn't work reliably even after some hacking.

For a work machine, it comes down to reliability and a hassle-free experience for me.