I think the reason the smell is better is because it all gets concentarated into a bubble and when the bubble pops the smell is concentrated like the popping of a nitrous oxide capsule, usually in an area right in front of the nose. Whereas a more traditional fart, other than in bed is distributed far and wide and you're lucky if you get a whiff.
Edit-Sorry Fabian missed your earlier post.
Edit-Sorry Fabian missed your earlier post.