Really? I don't know what I'm talking about?
You should check YOUR facts first. I was careful not to go in thw whole not upgradeable and proprietery hardware only, because one might prove me wrong.
It's a proven fact that windows and linux are much more secure. True windows will be targetted by more attacks due to number of users, but still it is more secure than a MAC. Just research it.
In multitasking MAC is just beginning to shine. Previous MACs were horrible, and this one isn't that good either. Both windows and linux multitasked very well 10 years ago.
Windows has a gazillion apps and with linux you get access to all areas on different level, which on MAC you don't. And linux is free and windows has great backwards compatability.