One of the the most helpful figures I have found when assessing boats (besides price) is the "working sail area per ton" which is the 100% sail area divided by the displacement
in 2,000 lb tons of the boat plus about 1500 or 2000 pounds per person (as the Pardey's define it) and they suggest the resulting figure should be above 78 or 80. They suggest that you often have winds of under 6-8 knots and in order to make headway, this figure should be greater rather than lesser (or else you can crank up the motor). At one ton per crew person, 2000 lb/person (2 people, add 4000 lbs) their Taliesin has 83 square feet of sail per ton, The Wanderer III has 79, Roth's Whisperer had 78, the Cabo Rico
38 has 66, Westsail 32 has 66 ... The "average" for 30-40' sailboats is something like 69. Mark's Beneteau
393 calculates out at 76 and very few boats have this high a figure. Perhaps that is why he is making good progress and likes his sailboat.