First, I have a license for Capture One Pro (3 seats) and it can be used on either Mac or PC. This is not a problem.
To use Capture One Pro, I need to have either native or guest MacOS or Windows. I have a license for Windows 7 and if needed, I would buy Windows 10 Pro. In the MacOS vs Windows dilemma, I would prefer a Mac for several reasons.
If needed, I could do a dual boot Windows 10 and Linux distro of my choice. I am not an expert in dual booting, but all online articles that I've read advised against it.
At the moment, most of the computer work that I am doing for myself could be done on Linux. I go for the ThinkPad x200s that runs Bodhi Linux for all daily computer work (even though I have an iMac 2010 and a MacBook Air 2013 (work notebook) at home). I just like the Linux experience.
I've tried all RAW converters available for Linux - they are not even close to the quality of the resulting images that Capture One can produce. To rule out an operator factor, one of the Linux photography professionals emailed me a RAW image. I've edited that RAW image in Capture One Pro and he edited it in digiKam and RawTherapee. Even though I am not a professional, Capture One Pro produced a much better result. The secret sauce is their proprietary RAW conversion algorithm that is the best currently available. So, it is the software not the operator skills that makes the difference.
As I mentioned before, my home iMac has a screen that started failing. Replacing a screen on a 27 inch iMac would probably cost $400-500. Repairing an 8 year old iMac for $400-500 does not sound like a smart thing to do to me.
Getting another Mac could be a solution. All iMacs has the same problem as all-in-ones have - one thing fails, then the entire system fails. That leaves me with Mac mini and Mac Pro. Mac mini is 2K in its maxed up configuration (3.0 GHz I7 with 16GB of RAM).
I have an iMac at work with 3.5 GHz i7 and 32 GB of RAM and it is currently working fine. Buying a Mac mini at a premium price with the outdated technology seems like wasting money. It will become irrelevant in two years.
Mac Pro is out of my price range and would be another waste of money if I bought it for the sake of one image editing piece of software. I've been using Apple products since 1996 and I am getting tired of them recently.
I do not want to be forced to upgrade when Apple decides that it is time for me to upgrade and I want to be able to choose hardware I like and want.
Outside of Apple, there are great brands like System 76, Alienware, Lenovo and others. I can build a configuration that I like.
This is where I am now.