To me, it was 2 main things on why I went to a mac. and an Air and a Mini.
I had been using pcs for the last 7 yrs and just couldn't take it any more, there is good news with windows and bad news, the bad news drove me nuts, freeze ups, control alt delete, and the ever growing viruses etc.
Then some people I know said "get a Mac" so i went down to the apple store and dove in. So for me the 2 main thins are, The operating system, not so much the features etc, they are nice, but my needs are not great.
The 2nd is resale, the resale of these machines is quite good, have followed it closely for the past few months.
So if I want to sell my 13" Air 3 yrs from now, 1 owner, very clean etc, it will sell for decent money, and put that into the newest one.
I would get my pcs serviced due to viruses about every 18 months or so,it added up. So i figure, not only will my Mac cost me less, it gives me better performance. But to each his own.