Last week, we just had a bit more time than usual and decided to run BG completely on T2CM. The loot was ... VERY underwhelming. On the following evening, we did it on T1 and got much better loot, e.g. twice as many symbols and crystals and more of the decent teal jewelry.
Were we particularly unlucky on our T2CM run? Or have other people observed the same loot behaviour which would implicate that the loot tables between T1/T2 are mixed up?
From reading the forums, I get the impression that there is also no significant difference between T1 and T2 loot in the 3- and 6-man instances. Same problem? Or is the difference between T1 and T2 too tiny to justify the additional effort for T2 and CM?
Of course, there are other reasons to do T2CM - just testing if you are up to the challenge. Here, I'm only asking if T2 and CM or the usually much faster T1 runs are the method of choice if you want to grind for particular items and optimize your chances.