Vitaly2017
Headphoneus Supremus
To my ears, the sound comparison only makes sense when it is relative to a specific IEM or pair of headphones. DAC/amp card doesn't have a sound. What we hear is a synergy between the source and the sound sig of a specific headphone/earphone relative to its design. It will all depend on a pair up, where perhaps class A/AB amp might drive and synergize better with some dynamic driver or planar magnetic drivers, while other amp might work better with multi-BA or hybrid iems.
I just did a quick A/B comparison of Fourte Noir w/1960 4wire between E02 and T01, and per your question of "Which of the 2 motherboard offer better airiness, sound stage and details retrieval with best layering and nuances? T01 or E02?" I find T01 to be better in this particular pair up![]()

I would have another question not sure if you have the plenue L ? I know its a warm sounding dap to and no android. I wonder how n6iiT01 compares in the same department of comparison.
" airiness, sound stage and details retrieval with best layering and nuances "
Thank you @twister6