What are the advantages of the PRT setup (Pan-Roll-Tilt) over the PTR (Pan-Tilt-Roll)?
With the PTR you can have the HoVer mode (Landscape - Portrait) as an extra and still use Tilt when in Portrait mode.
ANSWER :
If you want to do a HoVer rig, I think the PTR (roll is inside the tilt axis) is better for the reasons you give. I think this is the way most HoVer rigs are done.
If you want to make a stabilized rig using gyro servos, the PRT (tilt inside the roll axis) has an advantage. With a PTR rig, consider what happens when the camera is pointed straight down. The roll axis is now the same as the pan axis. Not only will the "roll" axis not sense and correct for roll, but it will now sense panning and try to undo any intentional panning motion. This will happen to some degree at all tilt angles other than the camera pointed at the horizon.
The PRT design places the tilting motion inside the roll mechanism. This removes the pan-roll interaction, allowing stabilization on each axis to work as it should.
If you want to make a stabilized HoVer rig, you may need to come up with a third option, since I'm not sure that either the PRT or PTR would work the way you would like.
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