Instead of the trigger group being lower, it could also be looked at as everything else sticks up a little higher. I think if the top barrel lines up the same with both styles, it just due to stocking. I think if the action sits a bit higher than the trigger hand, then I feel the muzzle rise a bit more, or to line things up the trigger finger has to point down more. There're good ones of both types, but the packaging seems a lot tidier with the shallow frame.