i went for the Jazz in the end. its more practical and quite fun to drive. practical kasi its got fiexible seating configurations that no other car can do. so that's good if u need to haul some stuff (fm. time to time).
if u prefer more hi-speed enjoyment. probably the Civic because it has much better aerodynamics than the Jazz.
Handling ? i really have no comlaints about the Jazz. though i'm not a boy racer type driver.....
Fuel Economy? accdg. to combined cycle of 2008 EPA ratings in the US, the smaller Honda is better - only slightly though.....
Looks dept? well its really subjective. so u should decide for yourself....
the other thing that really turned me off with the Civic is the high level intrusion of road noise into the Cabin. for me its just unforgivable for such a recently redesigned car.