Congrats on the DT880!
You find the T1 more aggressive? That's odd as their treble is more subdued than the DT880. Also the DT880, in my opinion, is a lot more picky with amps. The T1 just goes with the flow and sounds pretty good out of mostly anything. The DT880 can sound like poo on some gear or can even sound brighter, but I don't have this issue with the T1.
Also could you elaborate by what you mean as "more versatile"? Yet again that should be the T1 IMO.
I listen to a lot of electronic music, which could be a little aggresive in the treble. And the 880's have been more musical with this type of music. Also I find that with some rock music that it also sounds less fatiguing. With that said the T1's make instruments sound more real and present them in a more realistic 3D soundstage that the 880's can't touch.
But maybe the brightness (like the above post states) could be due to driver variances.
Edited by Matrixnobu - 6/26/12 at 9:32pm