I agree .The razors you list are all quite different.
I have the machined BB. Althought I prefer polished, the airplane theme of the BB suits with the machined finish.I don't know how the Blackbird looks machined but it seems to be quite fine, as this is going to be your fancy razor you might want to go all in, IMO.
BB is probably my favorite razor. Love the blade feel, efficient and weight. If I nitpick, I would critique the sharp corners in the handle and the length (could be 90mm instead 85mm). But is minor minor critiques (there is no perfection ).
I recommend a razor that isn’t on your list - the Karve Overlander.
I’m lusting an Overlander. So many goods reviews. A smooth mild-mid razor. But I never have a brass razor, I don’t know if I will like the patina.