Not having the lag or weak audio. Reviews that actually measure the display and the sound quality raved. My Klipsch buds, Grado cans and Bose Connects concur.
Now, if talking about the speaker, that IMO would not count for sound quality anyway.
Note 7 especially after the recent update rocks real hard and has very similar battery life in FHD and still looks better than the Plus. Seems something wrong with your devices. Respectfully.
Battery life will not be a strong suit with the V20. Significantly less battery life than Note 7, so good thing having replaceable battery
None the less, the V20 should rock.