[AdamITR]

Using a Bellari HA-540 Tube Amp, Nuforce USB DAC, and my Macbook Air / iTunes.  Is one a better choice?  Music: Pop, ie. Maroon 5, Adele, Dave Matthews, etc.  Thanks!
 
PS. I have the Shure 750’s, hate the comfort.

 

[Mad Max]

They're both good, they have their pros and cons versus each other.  I recommend that you try both out if you can.
I prefer DT770Pro.  Comfort is terrific on the Beyers as well.  Tubes + Beyers make a very nice combination to boot.