Apple has released a statement acknowledging a 2-3% increase in battery life with the TSMC chip. My guess is that percentage is downplayed by about 10% at least, not because I have done the test, or because I have both chips, but because Apple claimed only 9 people had issues with bending 6 pluses. We all know that there was way more then 9 cases, but because Apple downplayed it people accepted it.
if they admitted a 2 hour longer battery life (which these tests showed with the TSMC) people would go ape **** and it would cost quite a bit to make everyone with Samsung chips happy, by swapping them for TSMC.
I am on the fence truth be told, here in Canada I cannot return the phone as I have gone over the 30min talk time, here we either have 30 min talk time or 15 days whichever comes first. But I imagine if I was to go to the Apple Store and say I want a replacement because I have a Samsung chip I'd have a fight on my hands (I would get what I wanted believe me) but the hassle wouldn't really be worth it, it's almost like I would have to make up another reason like battery life, random reboots etc.
Edit: now typing this I think I will return it via online through Apple care, claiming battery life. Which is the truth I am getting 1hr-1hr 30min less than I was on my 6