Both Intel's oneAPI and AMDs ROCm/HIP stacks success are obviously tied to (and part of) the success of each companies future products. And today I'd bet AMD will come off better. They have multiple contracts for HPC systems with their future GPU products as well as an existing presence in consumer gaming products.

Intel's effort seem to be banking on the Aroura system at ANL. Beyond that I don't know who's lining up to by Xe GPUs? Though I guess oneAPI will fit into whatever they do further down the line.