Before someone links me another thread, I have done my research on both of these headphones.
The reason I am asking is because despite the HFI-580 being generally agreed to have better audio quality and is a better all round headphone, I will be wearing these for long periods of time.
My question is, how much more comfortable is the ATH-M50 over the HFI-580? Is it worth the tradeoff in terms of audio? Which would you wear if you would be spending a long session with them on?
Also a side question, would it be recommended I get a sound card as an upgrade from onboard sound for these? I would probably have a budget of around $100 for the sound card.