If you value your peace of mind I would suggest staying with the Mac.
Under heavy use Windows machines are generally just a gargantuan pain in the ass despite there compatibility usefulness in various situations. Therefore I only spot use Windows where I have no alternative. Most software these days is available for both OSā any efficiency concerns most likely will be resolved in future iterations of the software.
Certainly CUDA is useful in rendering/previewing, but I just havenāt seen it as useful enough to accept all the other long term system stability issues and generally more intuitive UX like keyboard shortcuts etc. with the Mac OS. All these masochists just want you existing in the same hell as they are.
(Truth be told you can excel with either platform it just comes down to where youāre most comfortable, as you probably already know.)
There are some developments that may also make the Mac the better performance choice, but you have to wait until June to really see what itās gonna be.
With Apple reformulating their āProā line of hardware and particularly the desktop along with the OS, so it would behoove you to wait until after WWDC to make a choice. It wouldnāt surprise me at all if they showed up with a new āProā line of Macbooks considering the reformulation process, if rumors are to be believed. Aside from that despite high heat concerns the latest MacBooks were performing betting then equivalent Windows laptops, which had biased reviewers like Linus and Austin Evans (mostly Linus) whining about excessive heat when they really were expecting to see much lower performance numbers.
AMD seems to making substantial progress in their fabrication of CPUs and GPUs. Outside of ray tracing specific tasks Nvidia RTX donāt really seem to push forward that far beyond the GTX 1080ti line. Also, it seems that after 3 years Vulkan development is seeing more adoption, the Vega64 graphics benchmarks using Vulkan are quite favorable compared to Nvidiaās newest GPU offerings and being the open standard itās going to be more preferable then a closed standard to a lot of developers. Apple has a close relationship with AMD where it concerns GPUs so the next gen Macs will likely benefit greatly from AMDs advancements. Hopefully Apple will adopt some AMD CPUs to mix in with their Intel CPUs while leaving the ARM rumors in the dust.
Even though I donāt immediately disqualify ARM as a potential desktop solution for creatives like some people do I highly doubt Apple would be able to reasonably produce such processors with compatibility compromises for non-mobile āProā devices at a price many people would accept.