AAC on android is just plain bad.
APTX-HD yes you can hear a difference, but it's subtle.
Problem with aptx-hd is when in big city it gets unstable because of radio noise all around and it chops way too easily (non HD is stable, because uses less bandwith).
LDAC is even better quality than aptx-hd, but really the differences are small (we are after all listening with bluetooth heapdhones, so nothing fancy).
In my opinion MUCH more important than those codecs are HP drivers and HP amplification.
Have those good and it will play great already on SBC codecs. Have bad drivers and it will suck even with LDAC.
So I still think KEF might be good (their speakers are stellar).
I also do not care about ANC, because it ALWAYS influence SQ.
So I have ANC always off and depend only on passive isolation.
That's why I was writing about it before.