Complicated answer. There were many outside factors that determinded the treatment of various groups. Like political prisoners were treated better than say the Jewish or Gypsies inmates. German political prisoners such as Communist and anti-Nazis for exaple could be reeducated to become Nazis. This group could be released from the camps to reenter and contribute to the Nazi government objectives in creating the so called "Master Race". Gays, Jews and Gypsies were treated more harshly depending on where they were comming from. For example those that were from the West tended to survive longer in the camps. Those that were citizens or had relitives living in the British Empire, the United States, Sweden, Finland or Switzerland were not gassed like those from the occupied European territories. Those that lived to the East were treated the harshest of all. Not only were they Jews, Gypsies, or Gays they were of the Slavic origin which in the Nazi world was the worst of the worst. Also in this group you would also find Soviet POWs that found their way into these camps. Then there was also the problem of logistics, political policies, and the cost to the human mind on the SS. The vast numbers of people to be exacuted were in the 100s of millions range living from the English Channel to the gates of Moscow. You also had a sigment of the population in the West that hid people from the SS even had the Underground in the west that would hinder SS train shipments of inmates. In the East there were reports of certain German Army units that protected Jews from the SS until they were able to excape into Finnish territory although those reports are few and far between resulting in the imprisonment of the German officers in command. You also had private businessmen, like Oskar Schindler for example, protected their workers from the SS. I tell you some of these stories so you can see that the SS efforts to round up, transport and maintain these killing factories were hampered on a regular basis from all over Europe.