I think using Apple software makes me vulnerable to malware. After so many years of driving a Mac without virus software, I have this sense of invulnerability that will probably end up biting me in the ass someday.
Until the last year, I gave no thought to malware on mobile devices. However, mobile platforms (at least some mobile platforms) are becoming a target. As much as limited nature of iOS can vex me, I don't ever want to deal with malware on my iOS devices. I don't envy Google and Apple in the task of keeping mobile safe.