Torvalds said he was using a Mac back in 2005: http://news.cnet.com/Torvalds-switches-to-Apple/2100-1003_3-...

He said the Mac was better than Vista, but called its FS "utter crap" in 2008: http://www.smh.com.au/news/technology/q-and-a-with-linus-tor...

Note that in the 2008 interview, he also said that he thought that Linux was better than both.