This chart (from Lou Stagner) suggests for tour pros the difference between fairway and rough is anywhere from 30-80 yards depending on the length of the hole.
Problem is if the premium on hitting the fairway is 40 yards, if you’re giving up 20 yards by laying up with 3-wood you’d have to hit a whopping 50% more fairways to make the trade off worth while.
Also I think the difference between fairway and rough is less for us amateurs than pros just because the rough we typically face is less penal. I tracked all my holes this year, and I’m only scoring 0.1 strokes better from the fairway than the rough.