It always is fun to see the free dive versus scuba spearfishing debates, especially all the false assumptions that get thrown about... especially by folks who have not done both (or either as in this case).
My experience, which is certainly more limited than DD's for example, is that it is much more difficult to stalk a fish on scuba.... at least it always was for me.
I could fill a cooler with fish free diving with a pole spear, but was lucky to spear more than 1 fish per dive using a pole spear on scuba... on scuba it was REALLY hard for me to get within the pole spear's effective range.
My experience was that free diving of course required a great deal more athleticism, but the "silent approach" that free diving provided allowed me more kills.
But comparing spearing, especially spearing on scuba, to a 2 mile wide drag net???
Sheesh.
Best wishes.