There is a difference in the way the Upton Sinclair and Eric Schlosser covered food safety. Both gave detailed descriptions of the brutal nature of the work conditions. Sinclair focused more on the food safety aspect. He described how workers would have different processes to destroy the smell of bad meat in order to sell it. Schlosser though focused on the working conditions of the workers. He described how dangerous the work is and common it is to get injured on the job. He also wrote about the cleanup workers who were contractors, some of  who have lost fingers, had little work protections even when injured. I think both excerpts represent a certain time when certain issues were more important. For example food safety in 1906 when Sinclair wrote his book. Today we have food inspectors and regulations where what was described by Sinclair would not happen today. On the other hand Schlosser focuses on the workers which today are still fighting for worker protections even today.