We run Blender's 2.91.2 benchmark tool, using the Classroom scene. Nvidia GPUs are testing using CUDA and OPTIX, while AMD GPUs are tested using OpenCL.
Looking at Blender render performance, the RTX 3060 is fractionally faster than the RX 5700 XT when using CUDA, posting a render time of 145 seconds. It can use OPTIX however, reducing the render time by 31%. This is on par with the RTX 2070 Super, with just a 1-second difference between the two.