I guess I just take administering my own security for granted, and generally run very similarly regardless of what OS I am using at a given time. It would seem that Internet security is the highest priority, and I routinely do the following:
1. Use multiple web browsers, for different purposes. I keep Firefox as my most secured, Chromium as the second level, and Opera as the third.
2. On Firefox, I install the following: NoScript, Ghostery, Flashblock, AdblockPlus
On Chromium, I install: NotScripts or ScriptNo, Ghostery, Flashblock, AdblockPlus
On Opera, I install nothing
3. I try to keep my general web browsing in Firefox, where I have the highest level of protection running. Some spillover of this goes into Chromium, which is also locked down pretty well. I use Opera primarily for known-safe sites, or ones that don't play nicely with the security extensions of the other browsers.
I don't use file sharing or torrent sites, don't install apps from outside the repos, and generally am very careful about anything I download.
Following these procedures has kept me problem-free for years, even on Windows.