Ask HN: How does Django in Windows compare with Django in Linux?

As a non-tech founder, I feel a bit out of line bringing up the idea of switching to a Unix based development environment to my CTO when all I have to go on is perception. This perception is likely in large part from hanging around HN / Reddit and reading discussions that involve developing on Unix. So my question is: are there compelling reasons for why many coders (particularly web developers) seem to prefer Linux over MSFT? Are there any tangible benefits to one approach over the other, not including cost concerns?