I thought all three bands were excellent, and each brought something completely different to the table (or stage, rather).
Music is as subjective a topic as they come, so arguing about which band is better than which is completely pointless.
07/31 - The Iron Maidens
09/05 - Billy Joel
09/19 - Def Leppard
10/01 - Queensr˙che / Scorpions
10/24 - Opeth