A simple salt water rinse is enough to deal with halitosis. Much easier and the effects seem to last longer than prescription mouthwashes at a sufficient concentration.
The study you cited actually shows that salt water was only effective for 3 hours, vs 5 hours or more for the prescription mouthwashes. Furthermore, all concentrations of the prescription mouthwashes showed significantly reduced bacterial populations with continued usage (meaning, they got more effective over time.) while the salt water rinse did not.