You need to ask macOS people for their prefill speed as well, there are two numbers you care about here, and current MacBooks have generally terrible numbers when it comes to prefill performance. Surely it'll get better with time, but if you already have a desktop, I'd go the "beefy GPU" route first.
Alright, show me the numbers then, whenever I ask any macOS people about their prefill speed instead of generation speed, they all seem to disappear :P