OS X more secure because of fewer compromises?

I'm sure we've all heard our fill of arguments as to why OS X is more secure than Windows, but today I found one at MacNN I don't think I've heard before: OS X makes fewer compromises than Windows in terms of backwards compatibility with previous OS versions, so says a BusinessWeek article. This totally makes sense, as OS 9 and OS X go together about as well as the latest iPods and FireWire..

..or do they? We can run OS 9 in the Classic environment inside of OS X even on the latest Macs available – I should know, as this weekend I had to learn how to install Classic on my fiance's iMac G5 running Tiger, simply using the original system discs that came with the Mac. I was able not only to install OS 9 apps for her, but it seems like I can leave them lying around almost anywhere I want and add them to the Dock – right alongside OS X apps.

Case in point: I would argue that OS X isn't more secure simply because Apple took fewer compromises – OS X is more secure because Apple knows how to compromise right.

[thanks for the edits everyone!]