“They” assuming you mean people who use a PC? The debate regarding pc vs Mac pretty much always revolves around on thing and that is which is best, well in terms of looks it’s Mac, in terms of performance per pound spent it’s PC, in terms of upgrade ability it’s PC, in terms of OS, both have issues, if your using a mixed networked environment then windows wins, hardware failure they are both the same, but try installing a HDD in an iMac, or a screen fail on an iMac and it’s goodbye entire machine.
We use both commercially and as a business we have seen both sides of the argument, the iMacs have sort of stood the the test of time, the oldest being about 7 years old, but only because we have moved them from their post production roles to say being just a tethered computer, But then again we have a 5 year old XP’s that’s still used in post production. I use iPads and iPhone, so have nothing against apples product, I just feel after using both commercially PC’s are a better option for us.