A spray bar and a sponge filter are two totally differant things. The spray bar itself is NOT a filter.
A spray bar is a type of return outlet from a canister or a sump. It disperses water over a wider area for a softer flow compared with a standard nozzle. In my own personal opinion they are over used and reduce the over-all flow rate of the filter.
A sponge filter can be either air driven...with an air stone and lift tube or power head driven for increased flow. Very good bio-filtration with moderate mechanical filtration capacities.