The Apple-II cassette interface is simple,
fast, and I think most reliable. The data
transfer rate averages over 180 bytes per
second, and the recording scheme is compatible
with the interface used with the
Apple- I.
Note that this is almost as fast as the
floppy disk drive on the Commodore 64. This is why people remember Woz but not the anonymous engineer(s) behind the 1541 disk drive.