The latest mobile amd zen 4 has a comparable efficiency* to apple m2 despite not being arm or having hybrid architecture. See 7840U.
* Within up to 15% at 25W.
* Within up to 15% at 25W.
Maybe in light threads that utilize many cores.
Most reviewers base it on Cinebench which is a poor indication of CPU performance for anything except Cinemark. Cinebench uses Intel Embree Engine which is hand optimized for x86. In addition, Cinebench favors CPUs with many slow cores - which is not how most software will perform. This is why AMD heavily marketed Cinebench for Zen1 launch and why Intel heavily markets it now for Alder Lake/Raptor Lake. In fact, Intel's little cores are basically designed to win at Cinebench.
Furthermore, AMD CPUs will rate at 25w but can easily boost up to 40w+ watts. It's up to the laptop maker.
Not sure what you mean by many slow cores, since mobile zen 4 has a better single-core performance than m2 pro.
Zen4 mobile does not have higher ST performance than M2 series.
https://browser.geekbench.com/processors/amd-ryzen-7-pro-784...
https://browser.geekbench.com/macs/mac-mini-2023-12c-cpu
7840u's ST is slower by 21% while consuming much more power during the test.