There are no measurements of the game-improvement capability of a club or clubhead that can take all of the possible individual game-improvement design factors into account.
In general terms with woodheads, the larger the head, the higher the clubhead's moment of inertia about the vertical axis of its center of gravity, the larger the face area, the shorter the length, the lighter the overall total weight of the wood, and the higher the loft angle on the clubface, the greater the game improvement capability of the wood will be.
With irons, the larger the head shape, the deeper the cavity on the back of the head, the wider the sole, the more round the sole shape, and the more loft on the iron face, the more game improvement benefit the iron will possess.
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