Um, nice attempt to change the subject. I take it you're saying that Windows does not handle PDFs out of the box.
However, if you want to get into the discussion of which platform is less likely to get hacked, I'm game. Let's look at statements made by Charlie Miller, the former NSA security expert that won the PWN2OWN contests three years in a row.
I'd still recommend Macs for typical users as the odds of something targeting them are so low that they might go years without seeing any malware.
As for his choice of computer:
I usually work on a pretty old MacBook that I've upgraded the hard drive on. Its been the computer that I had both times at Pwn2Own and its been in many countries with me like Korea, Japan, Australia, Malaysia, and of course, Canada. Hardware-wise, its pretty much stock--1.83 GHz Core Duo, 2 GB RAM. When I'm at home, I hook it up to a big 24" monitor. As for the winning notebooks, I only use my MacBook Air from last year when Im doing a big fuzzing run or testing something. I dont know what Ill do with my new MacBook Pro, but I definitely wont retire my trusty MacBook.