my logic said no such thing, I think its what you want it to sound like.
lets see, from memory, helium is a noble gas. which means it inert and reacts with almost nothing and has no hazardous properties, while hydrogen is not a noble gas and has very hazardous properties.
its very simple if you stick to the properties of the gas, you can add lib and make it up all you want, but facts are facts and your scenarios have nothing to do with the gas itself.