There are significant design and construction differences between the boats like: Jeanneau: conventional hull design with stringers, std engine installation with prop shaft. Beneteau: Hull with innerliner, sail drive propulsion system.
Beneteau seems to be a more of 'live onboard', Jeanneau more of 'sail the oceans'. Check out the load capacity! You may even read my 20.000 miles test of my SO 37 at
http://www.geocities.com/haffiman37