the way it's designed to be used, on my mod that's negative to the switch
would depend on the design of the switch, but should really be positive to where the vent holes are
That is not the most important factor imo. Positive down in a bare tube makes thermal runaway far more likely than positive up and we should focus on prevention rather than mitigating the consequences. The majority of respondents so far have either have an unfaltering view of their own ability to spot the smallest of holes in battery wraps every time or don't understand the circuitry of a mech.
See my post above. Don't want to sounds like a dick, and sorry if I have come across that way but it's an important topic. Which is preferable, an auto firing mod or a hard short via incredibly low electrical resistance of the mod tube and the button? That kind of short is more risky than low resistance builds etc imo.