Except for using slightly different apps, my thoughts on my PC and Macs are virtually identical [and our set ups but yours is better ]I was in the same boat and after a few years of hemming and hawing, I finally jumped in a got a 32core Threadripper dual 3090 build from Puget upgrading from a 10core iMac Pro. I'm mostly Ae+CPU based rendering currently but wanted to make sure I had a machine able to handle anything I threw at it. I REALLY wanted to stay on the Mac platform, but the current Mac Pro seemed like a dead end. I think these AMD cards are the last GPU upgrades we'll see for it, and the future AS Mac Pro seemed too far off for me to wait. I think there will be some growing pains before it fills the niche the current Mac Pro fills.
Pros
• CPU Rendering is obviously faster.
• Ae is much faster. The higher clock speeds translates to faster previews at a higher res. This is without running the MFR on the beta. Once that is out of beta it will make a big difference with 32 cores.
• GPU rendering is light years faster. I have not tried it yet, but Redshift RT will be PC only for what I'm assuming a good while before they make the port to Metal, so you will have earlier access to almost realtime rendering.
• I'm really interested in where Blender is going. It was clear to me Metal support for eeVee and Cycles was not a priority for them.
• I started getting into PC gaming.
Cons
• This thing is LOUD AF. Like way louder than I really thought it would be when just working idle in Ae and C4D. The initial fan curves for Puget had the machine revving up and down even at idle with no apps open. We've since adjusted the fan curve to be more aggressive and it runs louder more consistently now. A Mac Pro would definitely be way more quiet than this beast, and look better.
• Windows is horrible. File Explorer hurts my eyes to use. I can't believe anyone thinks this is proper UI design. There are File Explorer alternatives that are much better, but I'm hesitant to pull the trigger and hack the registry to make them default. I'm waiting out to see if Win 11 brings any improvements and gauge the over all system stability before I get hacky.
• It seems a lot less stable than my Mac. I've had system hangs and reboots for no good reason. Most of my system/Ae/C4D hangs were me just pushing things too hard/wrong and I knew why it did what it did. This is just random Ae is gonna hang while not doing anything too intensive.
For now I have a M1 MacBook Pro next door to my PC and a monitor and Logitech keyboard and mouse I can quickly switch inputs on. (I'm typing this on the MacBook right now). I do email and casual browsing on the MacBook, and I'm getting work done on the PC. Parsec works surprising well and would be a great option to just run Ae and C4D on the PC, but 30 years of muscle memory of hitting CMD was too hard to break, so I wound up swapping the keyboard commands using Power Toys on Windows, and Parsec does not translate keys the Mac for some reason. Really hope they can figure that out.
I was slightly worried about chip production/supply chains in the next year or two and needed to get a machine to get the job done now. If the next Mac Pro proves to be something that can do the work I need it to do, I will switch back in a heart beat. Then I'll have a cheaply upgradable render box I can hopefully move into the closet with some ventilation and sound proofing.
Hope this helps. Good luck!
It was current and future plans that swung me, plus simply better support on Windows for GPU’s and RT rendering.
Suffice to say, like you, my macs are not far away, but again not really used for productivity that much unfortunately.