I've heard that HTC's processor is indeed faster. I saw a speed test between the two on YouTube (it wasn't from Android Authority I don't think, but from some reputable channel like them), and the HTC clobbered the G6. It was a jarring experience for me, as I am a huge LG fan and was surprised at the lag between the G6's opening of apps.
Of course, it was only noticeable in relation to the U11 and I know the G6 is awesome; and every individual unit can perform differently... But I still haven't been able to get that experience out of my head. Even while playing with the G6 in-store, I couldn't help but think about it.