Numbers, FWIW . . .
For what they are worth:Portsmouth handicaps for a B331 and C34:B331: 79.9C34: 84.9So, the B331 is considered a faster boat. These numbers are from US sailing for 2005.Stability, from the RYA stability database:AVS, B331: 125 degrees. Stability Index (STIX) = 31AVS, C34: not given, STIX = 36 (higher number is better, uses AVS, displacement, plus other factors)Both boats carry a CE rating of A (offshore)What matters would probably depend upon the individual, their priorities and perceptions and may only mean something over a glass of beer.