What is the difference between Invert-T and Positive-T horizontal machining center?

What is the difference between Invert-T and Positive-T horizontal machining center?

What is the difference between Invert-T type and Positive-T type horizontal machining center?
Invert-T type: The bed is inverted T shape, the table moves left and right on the bed as X-axis, the column moves forward and backward on the longitudinal bed as Z-axis, and the spindle box moves up and down on the column as Y-axis.
Positive-T type: The bed of this kind of machine tool is positive T-shaped, the table moves forward and backward on the bed as the Z-axis, the column moves left and right on the bed as the X-axis, and the spindle box moves up and down on the column as the Y-axis.
The specific structure design refers to the following design drawings:
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