Lamm ML1.1 or M1.2

I am considering trying the ML1.1 or M1.2 with Avalon Eidolon Diamonds. They are similar in power rating but how different do they sound?

I don't have a conveniently located dealer and i will fly to audition them at HES show in LA.
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This is one of the questions I keep asking myself :-)

I went with the M1.2 for my Eidolons Vision.