As of no difference in compute workloads, I can put Blender as an example: https://techgage.com/article/blender-2-91-best-cpus-gpus-for...
(6900 XT is 20.6 TFLOPS FP32, RTX 3090 is 35.6 TFLOPS FP32 _and_ also has the tensor cores, AMD can't win there because of sheer brute force)
And AMD's software stack removes them from consideration for a huge extent of compute workloads. If they aren't ready to have a proper one, it doesn't matter how good how much their hardware is good or not, it might as well be a brick.
Either way, CUDA should be gone for good and replaced with something that's not tied to specific GPU. I welcome competition in hardware. I have no respect for lock-in shenanigans.
I wish CUDA wasn’t vendor locked, too, but AMD and Intel need to start taking GPGPU software seriously. They’ve dug themselves a massive hole at this point.