Absolutely!
Archicad is used by interior designers, store planners and set designers. It's not just for architects.
Both platforms work well; use the one you are most comfortable with. As mutli-platform software, files can go back and forth between platforms easily. The only difference I have to take into consideration is that macs read all types of fonts, PCs don't.
I would learn archicad and get familiar with its library which includes many furnishings before buying add-ons. Archicad's limitations are the more free-form shapes. They can be done, but with difficulty. That said, the custom profiler, as well as the free with archicad profiler add-on can make many atypical shapes. I'm not trying to discourage you from add-ons, but there is lot to archicad.
Have you tried the free 30-day trial? It's downloadable from graphisofts website.
Good luck!
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"