Guys, does someone have to have technical diving experience to compare the construction and brightness of two lights? His conclusions about what one needs to exit a cave may be dubious, but the original review, complete with a lot of photographs and the reasons behind his conclusions, seems fair enough. You can take the information for what it's worth and make your own decisions.
Personally, I DO like bright backup lights, because it IS nice to be able to signal over somebody's 21W HID. But the brightest backup light I've ever owned was the worst one, because it wasn't reliable.
Scouts and PTs both have good reputations for reliability, as far as I know. All lights can flood, and the flip side of the reliability of a twist-on backup light is that, to avoid pressure-induced burning, one can be tempted to back the bezel off TOO far and induce flooding. No amount of o-rings will prevent that.