Re: M1
M1 has both. It consumes a lot less power while delivering better performance. For instance my M1 laptop smokes my 5950X overclocked desktop. However, it still makes sense to use AMD if you need more RAM, beyond 64GB.
That being said having such desktop in a room that has no air conditioning is a nightmare. Everything is getting too hot - I presume it will be nice during the winter though.
Can't wait for Apple to release their workstation. Probably will cost an arm (;-)) and leg, but there will be no alternative.