While I wish I could say the same about the signature, the singular headphone / house sound in my collection that keeps bringing me back would have the be the Anandas, I quite like the Hifiman sound.I would strongly advice to reconsider parting with AQ cans. While I went with NH, now I wonder if I made mistake when I had opportunity to buy both pairs with nice discount. I've checked the same shop yesterday and they are all gone
There is something in AQ cans signature that always makes want to come back to them and I can't imagine having a setup without at least one of them. But you are right: sometimes they may sound a bit too dark.
I did let my cousin try the NightOwls though. He is a fan of the Sennheiser (non hd800) sound signature, and he liked it the most out of my collection. It is amazing how different everyone perceives music. If anything, I might hold onto it for my family