lol @ adl
I think you should just try both if you haven't all ready done so and find the one with the OS you like most, the new g5 is very fast so no problems there at the end of the day the best machine is the one your most comfortable using.
David 
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"