I can't speak for the cochran as I've never been in the water with one. I dive two VR3's and absolutlely love them. I've had them for about a year, so I'm not sure about the newest computers, but at the time, in my opinion, there wasn't a better computer on the market. You have total control both in the water & at the surface. settings can be changed during the dive. As far as seeing in low viz areas, I don't have much to compare my computers to, but the backlight can be programmed to stay on at different intervals. I have mine programmed to stay on during the entire dive. Never had a problem seeing the computer even in the worst of viz conditions. The VR3 also automatically swithches to the best gas for your given depth according to which gases you have programmed & turned on. There's not much you can't do with the VR3 & I would highly recommend it to any diver.