On average, Apple batteries are FAR better than the competition. Just the 6s/6s+ batch had issues I think - and of that, only a small percentage. And instead of just replace all the millions of 6s/6s+ phones they tried to minimize the problem with the downclocking. (My guess). Out of the millions of 6s+/6s owners, maybe only 30-55k had problems and of that, only a few thousand knew about it. (again, this is a huge assumption on my part).
But in my experience, Apple Batteries are exemplary. My 6+ had ~240 cycles after almost 2 years, 97% life left. My 6s+ had 220? cycles after 1.7 years and 95% life left. My Samsung Note 3 after 150 cycles had less than 60% life left (yeah probably a bad battery) - but my coworkers Note 3, same thing, and my coworkers Note 4 phones - same thing. The only good thing about Samsung, the replacement battery cost $10 on Amazon and with a removable back it was easy to replace.
I'm a HUGE battery OCD nut - and Apple's batteries are amazing imo - the hardware and battery are big reasons why I own an Apple.
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Wow look at that. Hard to argue with those results. That's proof in my book - quite a few others just like you.