If your workflow needs a faster cpu/gpu for Rhino and assuming this is the bulk of your workflow (computing time), then get what’s fastest.
Laptops are never the fastest or cheapest. Bootcamp is not going to make it faster. The Rhino Mac version seems like a weaker version of the PC from what i read in this forum.
A top notch user-assembled PC with 128Gbs of RAM, today costs 500EUs/$ without counting the GPU (i got a nvidia 3070 for 1000EUs) - 1500 max for a full machine. A laptop will keep you restricted to lower-tier perf forever at a premium price. I still dont think a laptop is the way to go if you need graphic perf.
Keep your macbook for your old SW or buy a used MacPro later. Invest wisely in a medium perf PC. Your HW cost will be 50% over the long term. (please correct me if im wrong).
Just my economic opinion on cost vs usability and time to get job done. I hate windows (the GUI), I hate macs since 20 years (sales policies) - i was in a few things at Apple that showed me the dark side of it. I respect both approaches. Macs were (then) super to install - PCs were horrible. Today, this is on par the same (but i have no experience reinstalled Macs to be honest - can you still copy a virgin OS installed on one machine to another? I was pleasantly surprised this worked on my last PC full HW change (MOBO and all)).
Short story why i think this way (i also studied economics and SW engineering)…
I have an old (my last - started with a 128K (and Apple][ to be complete)) mac PowerPC 8500 in a box just in case - i was a Mac professional dev/designer and engineer until 2000 when my 1 year old top notch/$ Mac was obsolete in view of OSX. 20 years and 7 or 8 PCs’s later - 3 of which are still running - a top notch PC that cost 1500 to fully refurbish to top spec, a holiday/rhino6 capable laptop - and a 15 year old PC laptop running my cnc. I still hate windows day to day usage (save dialog most of all)… But Mac vs PC budget is 10/1 given how often I update. And perf never slows down on these PCs. Just drop a new CPU or GPU and your good to go (every 5 years you’ll need a new MOBO and RAM if you really want to keep up with the OS (see Windows 11 coming with new HW restrictions - i still hate MS - but note Mac’s have done the same thing over and over…).
Last note: Remember that OS and Apps are ever more RAM/CPU hungry to handle more new features including features, security, faster IOs etc…
Why would you want to render on CPU instead of GPU?