Of course the fact remains ...
that Windows 7 loads and runs faster on a Mac than on most (all?) PC's. (WashPost Tests) And yes, Windoze 7 may finally be a real operating system.
Of course, I have been waiting for Microsoft to crush Apple since 1984 when I bought my first Mac. ;-)
The Aperture vs. Lightroom contest is actually a bit closer. In simplest terms, Lightroom is faster to market with slightly nicer editing tools, Aperture is a much, much deeper program - which may be utterly irrelevant to most users unless you have lots of images to search, like full screen editing, use soft proofing, and a few other things. The only "wrong" answer to this question would be to keep switching and never master either program.
And of course, if you have been using Photoshop since release I, there is no reason to stop - it is still WAY more powerful than either LR or AP.
Edited to Add Disclaimer: I am far from a professional photographer - I just like to take pictures.