I think generally the consensus of Apple Silicon is that they're great _for a laptop_, but still aren't going to beat a dedicated graphics card + high-end CPU like i9/Ryzen 9. Biggest thing going for apple is the performance/watt though which is critical for a laptop.
I think this is missing the main reason to use Apple Silicon, which is that your dedicated graphics card probably has 24GB or less of RAM, whereas e.g. an M2 Ultra Mac Studio can have 192GB of RAM with a far superior memory bandwidth to anything on x86. This is important because even a "small" LLM like Llama2 13B would require quantization to fit in the 24GB RAM that the dedicated graphics card will give you, whereas the Mac could run Llama2 70B without quantization (at FP16).
They're better than most consumers x86 CPUs but worse than using a GPU. Where they shine is when the ML model can't fit the GPU's VRAM since you have better options for ram size with macs.