Maybe "sense" is used in the novel as meaning something along the lines of discretion or prudence. A person of “sense” (not especially meaning someone who has cornered the market on common sense or intelligence here) would feel things, but would control his or her feelings by rationalizing them. And maybe "sensibility" means something more along the lines of someone who is emotive or who might over-romanticize things. A person of "sensibility" would not check his or her emotions, where a person of "sense" would. However, both a person of "sense" and a person of "sensibility" would feel things deeply - the difference would be in the way each handled those feelings. Maybe the idea isn't which one is better, but that some level of both together - some middle ground - is best. Oh! Maybe that's why it's "Sense and Sensibility" and not "Sense or Sensibility"?? I never thought of that before. Maybe??