I think it probably varies according to the user. I really dislike the ones that have one wider strap with velcro at the back where you can adjust the tightness. The sewn-on velcro is stiff and scratches/pokes the back of my head (I keep my hair very short) and the single strap is usually located at a position where it sits on top of my ears and I find that irritating.
I really like the softer masks that have two very thin elastic straps - I can keep them well away from my ears and they're very unobtrusive.
I imagine the shape/size of one's head plus how much hair there is can make a huge difference and the manufacturers are trying to do a one-size-fits-all product, so the outcome is probably less than ideal for most.