Pretty sure the Amiga Technologies models used modified PC floppy drives instead of standard "Amiga" drives which could cause the odd incompatibility with floppy based software.
There is also a difference in the keyboards. One of the Amiga1200 revisions had problems with several keys pressed at one, that was easily noticable by the people who used ProTracker daily. I think the bug was fixed in the later A1200 models.
