How many layers of fiberglass do I put on the deck and bottom?

There are three main fiberglass layups and it's a trade off between strength and weight of the board.

1. 4 oz bottom, 4/4 deck - lightest and adequately strong

2. 4 oz bottom, 6/4 deck - stronger deck and rails resists dings and dents better but a little heavier

3. 6 oz bottom, 6/4 deck - strongest all over but heavier