I find it hard to believe anyone would want an ad campaign entitled, "World's Fastest Personal Computer". Nobody can hold that title for more than a few minutes, so it's an awful lot of trouble to try it. :-)
It bugs me that people are squabbling over a few minor marks. Who cares if the performance is off by a few percent? People were slamming AMD a few years ago because the P4 was beating the Athlons. "Ooh, in this benchmark, the P4 is a whopping 10% faster! What an embarrasment! AMD has completely lost it!" Yeah, never mind the price spread. I didn't want to spend twice as much money for a sliver of performance, which is why I got a 2.4Ghz P4 instead of a 3Ghz. (If I had known my stability issues were because of bad memory, I would never have replaced my 2600+, even though it was very noisy).
Just because something is faster, doesn't mean it's better. Besides, how expandable is the G5 tower? To me, a tower is NOT a tower if it only offers one drive bay and three PCI-X slots. This isn't so much an x86 vs PPC issue as it is a PC vs Mac issue.
As for why I slam the AmigaOne if performance isn't important, well, the price/performance margin of the AmigaOne is just *TOO* different from a typical PC. There are limits.