X64 does have a stronger SIMD story, but this is partly compensated for by the fact that ARM64 is much easier to decode wide. M series has a very wide decoder and a lot of instruction level parallelism. It can turn chunks of those 128-bit SIMD operations into what amounts to wider operations.

AVX still wins though.

M series still wins on performance per watt and now apparently leads on general purpose code.

All these leading edge chips are very good. We have an embarrassment of riches when it comes to blistering fast chips here.