If you want a professional quality development machine, buy a 2008 Thinkpad on ebay (cost is about…

If you want a professional quality development machine, buy a 2008 Thinkpad on ebay (cost is about $80) and install Linux on it. It’ll remain perfectly good for the next decade, and perform all your development needs.

OSX is only marginally better for development than Windows is, and a professional should use neither, except for testing and packaging — and don’t you have access to build farms and test farms for that?