Hello StewsArt,
Once upon a time, long long ago, if you were doing art and graphics, Mac’s were omnipresent in studios.
But now I honestly don’t think it makes any difference.
I switched to Macs’ long ago and am now too set in my computing ways to relearn Windows!
And it has to be said that sadly from a Mac user’s point of view you will get much more hardware bang for your buck with Windows based computers.
But regardless of OS you will want;
1, As fast a multicore processor as you can afford.
2, As much fast RAM as you can afford.
3, SSD drive
4, As for GPU, well AR doesn’t use this much but in general I would look at something 2GB or more simply because I use other apps that do utilise GPUs.