There's a proper hand to wear your computer on? Never really thought about it, my watch is comfortable on my left wrist so that's where I put my computer. Why is it better on the right?
Gombessa: hilarious video, thank you for that!
Your power inflator hangs over your left shoulder (and on more minimalist BCs/wings, the sole OPV is on the left side as well). Also, the shoulder or cuff dump on a drysuit is on the left arm. Having your computer on your right wrist allows you to make buoyancy changes with your left hand while keeping track of your depth/time simultaneously.