The M1 has pretty high memory latency at around 100 ns [1], which is significantly higher than either AMD or Intel for typical systems. Note that physical distance between CPU and memory is rather less important for latency, as DRAM is high latency in itself, so adding a few ns at most due to wiring is not going to matter.
[1] https://www.anandtech.com/show/16252/mac-mini-apple-m1-teste...
Not the most scientific, but userbenchmark is useful because it has latency graphs available for millions of systems.
Latest gen Intel with LPDDR4x chips is well over 100ns https://www.userbenchmark.com/UserRun/40531587 While the same CPU is almost 40ns faster with SODIMMS of DDR4. https://www.userbenchmark.com/UserRun/40527352
But sometimes we are just lazy to provide the context or to spell out everything. These information is so readily available with a simple Google. And yet the past dozens of M1 thread this "memory" advantage thing keeps popping up.