Only the top variants of M5 Max have more than twice the memory bandwidth of AMD, but those are much more expensive, i.e. over $10,000.

M5 Pro has as slightly higher memory bandwidth, but currently it is available only with up to 64 GB of DRAM. Even with this small memory, it is more expensive than either AMD or NVIDIA, especially when you do not want a puny SSD, but a normal-sized SSD, i.e. big enough to put there an LLM if you want to compute a quantization yourself (i.e. more than $5600 with a 4 TB SSD & 64 GB DRAM).

If you want to do LLM inference, I do not see Apple as a competitive solution, as their price is much, much higher, while also having limited expansion for SSDs, where you need a lot of space if you want to store a few LLMs.

The only thing that is correct is that the AMD Strix Halo system used to be much cheaper than NVIDIA, but now it has the same price. The CPU of Strix Halo is better than that of NVIDIA, but the NVIDIA GPU is likely to be better than the AMD GPU and CUDA is guaranteed to work fine.