The basics are simple. Assuming a mono hull for offshore use
heavy: 20k+lbs for comfort!!! & sailing upwind
Full keel: Good tracking/easy for autopilot to control/easy grounding
Long water line: This results in speed. Weight is irrelevant to speed in cruising context
Center cockpit results in: Big engine room, dry high cockpit, huge aft stateroom.
If you go offshore, remember it is tough on you and your gear. Expect lots of gear to die.
s/v Free Spirit