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(thermal recalibration based on servo burst reads, a big deal with modern areal density)The primary distinction between the two designs is that the stepper motor is an absolute positioning system, while the voice coil is a relative positioning system
A stepper motor has no way to compensate for expansion or contraction of the disk:
Older hard disks that used stepper motor actuators were much more sensitive to orientation. It was in fact often recommended that the low-level formatting of the disk always be done after the disk was installed in its operating position, to avoid any shifting of the location of the tracks that might be caused by changing the orientation. Since hard disks today are much more solidly built, and they use voice coil actuators for dynamic head positioning, this really is not an issue. A modern hard disk can be side-mounted in the case without any problems, and can also have its orientation changed after it has been in use for some time.