Apple is historically better in terms of privacy than Microsoft. From resistance to government data requests to just their posture on data collection, it is an improvement. They rely less than Microsoft on advertisement and service based revenue and more on hardware sales which do not require the same level of invasive collection.
I don’t mean to sing their praises too loudly, but between the two I think Apple is a clear favorite. And couple that with a better, BSD-based, OS and I think you’ve got a winner. Unless of course you include alternate, clearly superior alternatives, like GNU/Linux.
But hardware alone? MacBooks can’t be beat.
Different parts of the government. Both existed then and now. There has for a long time been a substantial portion of the government, especially defense and intelligence, that rely on encrypted comms and storage.