Not even close.
OS X simply does not offer massive support for business computers. It just does not exist. Windows does. But you need to buy windows 8 for business, which is like 1,500 bucks for 5 copies. You also need to buy windows office 360 for almost 4,000 dollars per 5 computers.
With ubuntu, you pay zero.
The real problems comes down to support. Microsoft will not help you integrate or support you behind basic problems. For anything more then that or to help you install for your personal problems, you will need a windows certified pinpoint professional. They run about 2,000 dollars a month. Will require a contract and will admin your system.
With ubuntu, you pay 3,000 bucks a year for the same services.
24,000 dollars a year vs 3,000 bucks a year. Not even close.
I played this game a while ago.
I went with windows 8 integration. After fighting windows 8 for 6 months, I dropped the whole thing and went with ubuntu.
For the cost I would have paid for the other 6 months of service, I could pay the termination fee and 3 full years of service for ubuntu.
The system now work flawlessly and I am not fighting windows 8.