Fundamentally, it seems to me that they're all the
same basic hardware,
timing intervals between flux transitions.
So other than the soaftware, what's the difference?
I could make a stupid comment and ask 'what's the difference between a
PDP8, PDP11, PERQ or HP9830?'. Apart from having finite memory, all
are (I believe) equivalent to a Turing machine.
But more seriously when I started asking about writing images to
floppy disks, I asked what options were available and what I'd need.
Apart from the (IMHO) stupid suggestion of a 1990's PC compatible, the
only thing that was mentioned to me was the Greaseweazle. Nobody
pointed me at web sites giving comparisons between the various methods
and devices.
-tony