What impresses me is the energy usage efficiency. iOS seems to be, generally, well tuned. Although somewhat invalid to compare "apples to android" (see what I did there?) and solely comparing mAh v. SOT, standby, etc., my general thought is an iPhone 6s "roughly" equates to an android running lollipop with a battery 2x the capacity of the iPhone. This is anecdotal of course. Yes, all the nerds will come screaming out of the closet and say that there rooted, customer rom'd, 86-core, 16gb RAM android gets 100 hours SOT, etc. Whatever.
There will also be the different species of nerds that ***** about not being able to go 24 hours streaming 3 different movies 5 different streaming audio apps and record a squirrel in 4k for 8 straight hours while updating frikkin Facebook every time they take a breath. Again, whatever.
If something can get me through a business day until the evening I am good. After that, I have no phobias related to cables and chargers. Spiders are a different story
FWIW, I use a Note 5, a moto and an iPhone. Love them all - not a fanboi of any platform.