I don't know if you've been introduced to the Denon AH-C700 yet, but you may want to look into these if you haven't already. I've not experienced either of the phones you are debating, but I've really taken a liking to the AH-C700.
The lows are very present, and after some extended use seems to have settled in a bit and become more controlled while still having a lot of authority.
Just throwing this out there for your consideration.
