Chris J
Headphoneus Supremus
I've had both side-by-side in my system for an extended period. Is it a night and day difference? No. Is it a difference significant enough to choose the 600 Ohm? Definitely!
I've spent some time comparing the 32 Ohm to my 600 Ohm DT880.
The 32 Ohm MAY have had a touch more sibilance, but that would have been it.
I suspect I could have easily lived with either version (at the time I owned a SS amp that could have driven either version).
OTOH I typically used my 600 Ohm DT880 with an OTL tube amp, it does not work very well with 32 Ohm headphones and other low impedance headphones, the amp's output impedance is way too high.