I'm not sure it really matters which side. After all, you can't have a diff loosen itself when fitted one way but not tighten itself when fitted the other - can you?
If it did loosen or tighten, I would suspect something is wrong in the diff assembly - probably with with the thrust race as in theory, the screw head should not be affected by the rotation of whichever outdrive cup it resides in.
I tend to fit mine so that the screw hex head is on the side which makes it easiest to access for adjustment. In the mid car, this is (for me) with the hex screw head on the right.
For the rear car, I would be tempted to build it with the screw hex head on the left side - purely because the spur gear cover is on the opposite side so I imagine access would be easier on the left (for the rear motor).
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