I would guess that it would be very difficult to configure all your apps and settings in two dissimilar phones the same. The battery life on both is not bad. If one is bettering the other for you, its possible that someone else could have the opposite just because of how they have their settings configured, launcher used, heck... even the brightness setting you used could have a huge impact on it. So I don't pay a lot of attention to pissing contests between two similar phones. If one was 50% more than the other, I'd pay attention. I had a 6S+ before the Note 8, and they aren't hugely different. The 6S+ had definitely lost some life over the years, but comparing new to new... very similar.