Although I do own a Sub, I chose other. If I were to dive, I would want my Casio with me as it is amazingly accurate, and has other features on the watch that are useful when diving. When in the water, I would rather functionality than fashion so to speak.
I vote "other". My next purchase absolutely, positively will be a diver and HAS to be either a Seiko 600M or 300M MarineMaster. I go back and forth between the 2 as both have amazing quality and "real" professional credentials.
The 600M is great with the superior depth rating, SpringDrive technology, titanium, and sapphire crystal.
The 300M intrigues me with its absence of case back (it is a monocoque case) and Grand Seiko caliber movement.