It’s been a long time since an Audio Research component was in my system. I had a preamp from the early 2000s that I was the third owner. I enjoyed it but sold it when I was going through a divorce and saw it listed for a thousand more than I had paid for it, so at least back then they were holding their value. I have to say the one Mac CD/SACD player that I heard sometime before the pandemic didn’t do much for me when I had it in my system for weekend. I prefered the Oppo 105 that I was thinking of replacing, although the Mac had a bigger soundstage and looked nice, the Oppo sounded more realistic to me. The Mac was big and hazy and I thought really poor value for money.
Things change in digital, so my comments may or may not be relevant, except that both labels are known for cultivating a house sound. If you can’t audition in your own system, I’d get the ARC, and forgo the pretty glass and meters on the Mac