power maybe? I'm not so sure. But with SQ, the Hugo is definitely ahead of the Mojo but it's not significant. When I tested both, I found the Hugo to be more open sounding, 3D, and detailed. This was especially noticeable in trance tracks. The Hugo is smoother sounding though, so depending what you like. If I had to put a figure on percentage, I'd say about 23.333333%
I only picked the Hugo cos I couldn't stand the intermittent buzz sounds that occurred when I received a message or email. That sound nearly blew out my ear drum. With the Hugo, that sound is reduced to barely nothing, even with my phone strapped to it.
For me, as my source would be my mobile, I like to surf, check, email etc and flight mode was definitely not an option, as I don't want to miss calls.
I've also found that the output from the Bluetooth setting sounds a lot better than plugged in to the iPhone 6plus.
Then again, the Mojo is exceptional value compared to the Hugo. With iems, there is a slight hiss background which was a bit annoying with really low volume music but ice grown accustomed to it and don't mind it any more, but if you're only using iems and hate hiss, then the mojo is for you.