NVIDIA Grace is an ARM-based CPU aimed mostly for the high performance computing (HPC) market. The closet thing it's competing to against Intel or AMD would be Xeon and EPYC respectively. But due to the target market and applications of this sort of processor, it's not really practical to compare it against Intel, AMD, or anyone else in the HPC market.
Basically, whatever system this will go in is likely going to be doing a few things, but do those few things very well.