Well, like I said originally, there's _different_ software on the Mac for astro, just not necessarily better or worse..
Amiga and SGI...now there's a nerd after me own heart
I used to have a bunch of both of those until I was forced to thin the heard when moving here
the reality is neither have the horsepower to run a web browser properly these days, and the fruit pies and NUCs and so on have more than enough geekery packed into a tiny box these days to make them great for astro.