I had both before, though I no longer own either now. I do have to say that I drastically preferred the T1 over the Edition 8. The T1 sounds great with just about everything, including classical music -- excellent tonal balance, very quick and detailed, a natural soundstage, and some of the sharpest imaging I've heard with any pair of headphones.
I may be somewhat biased, as I personally did not like the Edition 8. It was too strong in the midbass for my liking. About the only thing I could say that it did better than the T1 was isolation. The Edition 8 did block out nearly all exterior noise and provide a very quiet background, so it became possible to hear very low-level details with the Edition 8, which was kind of cool.
But other than that, I'd go with the T1. Please note, though, that the T1 requires much stronger amplification than the Edition 8. The Edition 8 is adequately powered by just about anything, whereas the T1 needs a good headphone amp to really shine. I've found that OTL tube amps pair well with the 600-ohm Beyers.