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Atomic B2 ... or any of the Atomics. 'Well known for nearly any direction you go UW. I often get into some photo positions upside down, & not only dry breathing, but super easy flow as well.
This relates the facts oof physics to which ALL regulators MUST contend. No single hose regulator with the diapram at the mouth, side exhaust or not, can breath as well upside down as rightside up. Some are worse than others but they still must follow the physical facts. The difference is not between the diaphram and the mouth but the diaphram and the LUNGS.