Well, Apple certainly did pioneer in the graphic arts and publishing (or rather the software companies did for the platform). The first utile DTP and graphics applications ran on Macs. I remember using an early version of Illustrator on Windows (the first). It distinguished itself by not actually working. It made sense to capitalise on that market and the fact that Windows was for the types of people who liked spreadsheets (ironic, I suppose, considering Visicalc.) QuarkXpress, Pagemaker, Framemaker all ran on Macs.
These days, things like Creative Suite run equally on either platform, so I don't think to be honest it matters for graphics and publishing. Music and sound, more so, there's a lot of faff on Windows to avoid latency issues. Animation, unless you have the budget to pimp up a Mac Pro, can benefit for the hardware heft available for fewer ££££. But that's top end renders, not the sort of crap I churn out.
It don't matter. This 27 inch retina iMac is gorgeous and I don't care, I love it. Platonically, of course, anything else would make a mess on that pristine screen.