You very clearly have no experience on powerful desktop machines. A 9950x will absolutely demolish an M3 or M4 Macbook Pro in any possible test, especially multicore testing. And I don't care how "performant" or "efficient" you think it is, those M series chips will be thermally throttled like anything else packaged into a laptop.

Oh, and the vastly superior dekstop rig will also come out cheaper, even with a quality monitor and keyboard.