You may not have considered the Intel Arc GPUs. Basically they were bad on Windows and are slowly improving, but unsure about their state on Linux. The cards were quite bad at some point, and well worse than an experience with NVIdia, despite the libre stack.

I would say the "best" depends on goals here. I generally encourage use of AMD over NVidia, but the difference is quite small. If you're already going with CachyOS, then you're well beyond the skill level to be able to navigate the tiny additional complexity of an NVidia card. Just buy the best bang for buck and your use case.

As for Mali, recent kernels and Mesa versions have made significant inroads. I do believe we'll get pretty good support for Mali by the time the Qualcomm ARM Laptops become available for Linux.