Yeah power consumption (and performance per watt) is the main reason I keep buying Raspberry Pi, I haven't find anything similar on that regard, specially for pi zeros
I thought x64 was better for perf per watt just because perf is so much better
I really like the ecosystem around them. All of the nice compact hats, the software, the 3D print files. Very googleable which also means easy to get help from an LLM.
It's also very hard to encounter x86 machines that can be powered from PoE.