Why would they be better?Edit
A broad spectrum antibiotic is better for upper respiratory infections due to the various types of bacteria that can infect those areas. Using one can ensure that the bacteria is killed.
Overall Resistance with antibioticsEdit
There is a worry about resistance and whether broad spectrum or narrow spectrum is better. Scientists agree that it's not one over the other, but rather how they are used - the dosage, length of time they are used,the amount used, and reducing the transmission in general.
Carbon C. Isturiz, A. 2002. Narrow versus broad spectrum antibacterials: factors in the selection of pneumococcal resistance to beta-lactams. Drugs, 62,9,1289-1294.