Lets face it, whatever benchmark results a vendor (*gasp*) publishes always draws a certain amount of suspicion. Luckily however, T-Mapy (Czech Republic) have just made available a detailed independant 20 page report on ERDAS Apollo vs ESRI ArcGIS Server.
T-Mapy have a long history with ESRI and now also ERDAS technology so they offer great perspective and expertise on both products. Michal Å eliga has done a wonderful job analysing performance and other metrics for serving a very large (290gb) 10cm aerial photo via WMS. Word of the day goes to “eyemetricaly worse” on page 13