A couple of Qs
1. Windows or Ubuntu - Which platform suits Hashcat best?

2. Does Hashcat utilize the GPU on the newest Radeon Adrenalin version of the Win drivers?

3. Is there any guide for which order the setup and libs for Linux should be installed?
1. same speed if you configure the system/fan/power usage correctly, why should the operating system matter ? we are talking about dedicated/separate OpenCL devices after all
2. hashcat is able to use use all GPUs that are correctly installed and configured (hashcat doesn't discriminate at all)
3. you just install the driver from the vendor (nvidia.com for nvidia and rocm or support.amd.com for amd), Intel OpenCL runtime for most CPUs (no matter what vendor they are in general)