Stable Diffusion is seeing more use for professional content creation work. How do NVIDIA RTX and Radeon PRO cards compare in this workflow?

Stable Diffusion is seeing more use for professional content creation work. How do NVIDIA RTX and Radeon PRO cards compare in this workflow?
AMD’s has released the Radeon PRO 7000 series of graphics cards featuring up to 48 GB of VRAM. How do they compare to NVIDIA’s RTX Ampere and Ada GPUs?