I asked this question in the class I am taking this morning and was told it was a matter of personal preference.
Is there conventional wisdom that indicates up versus down while in transit?
This machine is a Bernina 801 (vintage). When I took it out of the shipping box last summer, the bobbin door had come open and the bobbin and case had led a merry chase through the case. I snipped through a lot of thread. Happily, when I had the machine serviced a week later, she found no problems in the tension or general operation.
I worry about breaking a needle or knocking something out of alignment.