halocline
Contributor
DIN is more reliable because the o-ring between the tank valve and the first stage is enclosed within the tank valve. If the first stage gets bumped or kicked during the dive, there is much less chance of the o-ring being compromised on a DIN vs. yoke. Yoke connections are reliable. DIN is more reliable. Safe diving is all about putting all the odds in your favor whenever possible.
I understand the concept completely, I just don't think you can definitively say "DIN is more reliable". Got any proof? Other than your assumption, I mean? I realize it's intuitive to think that because the system "seems" more reliable that it actually is, but unless there's evidence....for example, one real-world measure of reliability is in how the system would hold up in the abusive environment of rental and charter diving over time.
I wouldn't be so sure about the bumping, BTW, especially with 300 Bar valves. Those walls of the valve can be pretty thin, although the presence of the reg does (I assume) significantly strengthen the valve. I've certainly seen DIN valves get knocked out of round pretty easily when tanks fall over.
I do like the thicker o-ring that DIN regs use, and I always use DIN fittings on my doubles. It's not like I'm against them, but I know of zero evidence that they provide even the slightest safety advantage in OW recreational diving. They absolutely are an advantage with regards to entanglement hazard in restrictions.